American Football Rules

American Football Rules Sonderregeln

Keine Regeln, sondern freiwillige Vereinbarungen sind die Rules of Conduct genannten Verhaltensregeln für Spieler und Trainer. Beim American Football. Das Passspiel, englisch auch Passing Play, ist eine Möglichkeit zum Raumgewinn im David Nelson: The Anatomy of a Game: Football, the Rules, and the Men Who Made the Game. University of Delaware Press, , ISBN 0-​ American Football Rules. Spielfeld. Das Spielfeld ist in 2 Hälften zu je 50 Yards unterteilt. 1 Yard = 91,44 cm. American Football Spielregeln. Mit freundlicher Genehmigung von Rhein Fire, die mir die Spielregeln von Ihrer alten Seite (als es die NFL-Europe noch gab). AMERICAN FOOTBALLHistorie – Regeln – Verletzungen - ErfahrungenAmerican Football History – rules – injuries – experiences. Author links open overlay panel​.

American Football Rules

Schweizerischer American Football Verband (SAFV). AMERICAN FOOTBALLHistorie – Regeln – Verletzungen - ErfahrungenAmerican Football History – rules – injuries – experiences. Author links open overlay panel​. Das Passspiel, englisch auch Passing Play, ist eine Möglichkeit zum Raumgewinn im David Nelson: The Anatomy of a Game: Football, the Rules, and the Men Who Made the Game. University of Delaware Press, , ISBN 0-​

American Football Rules Übersicht nächste Spiele Herbst-Cup A/B Gruppe Ost

Die Strafe beträgt fünf Yards. Returner : Die Returner Einfach Pp sich die Kickoffs und die Punts und versuchen mit dem Ei dann möglichst bis in die gegnerische Endzone zu flitzen. Single-Bar Facemasks mit nur einer querlaufenden Stange sind ebenfalls nicht erlaubt. Diese parallel verlaufenden Reihen bezeichnen wir als Hash Marks. Schiedsrichterzeichen Eine Übersicht über die Schiedsrichterzeichen finden Sie unter Schiedsrichterzeichen — übersichtlich erklärt. Des Weiteren gibt es in vielen Teams so genannte retired numbers zurückgezogene Erfahrungen Mit Faber Lotto. Jede übertriebene Härte, speziell gezielte Hits nach dem Spielzug und in den letzten Jahren verstärkt auch Hits gegen schutzlose Receiver.

American Football Rules - Übersicht nächste Spiele Herbst-Cup A/B Gruppe West

Wenn die Offense einer Mannschaft auf das Feld kommt, hat sie vier Versuche, einen Raumgewinn von zehn Yards oder mehr zu erlangen. Ausnahme: der "man in motion". Hinzu kommen aber noch positionsspezifische Aufgaben. Generell muss sich der werfende Spieler immer hinter der Line of Scrimmage aufhalten, ansonsten ist der Pass nicht gültig. American Football Rules Das Finale ist der jährlich ausgetragene Hochschulbowl. In seinen Feinheiten unterscheidet es sich jedoch. Wenn der Coach bei beiden Challenges Recht bekommt, so bekommt das Team eine dritte. Diese kann aus 3—7 Schiedsrichtern bestehen, wobei jeder Schiedsrichter einen bestimmten Bereich des Spielfeldes beobachtet und für spezielle Aufgaben zuständig ist. Sie steuern die Abwehr und räumen in der zweiten Verteidigungsreihe gegen die Ballträger ab. Punter während der Trittbewegung drauf und versuchen, den anfliegenden Football zu blocken. Typische Passverteidigungen Tipp24.Com SeriГ¶s die NickelDime Spiele Dragon Prophecy - Video Slots Online Quarter. Am Ende des ersten und dritten Quarters folgt jeweils ein Seitenwechsel. KГ¶ln Vs Frankfurt Team-Touchdown. Im Anschluss an einen Punt wechselt in aller Regel der Ballbesitz. Backup Ein Ersatzspieler, der sich in der Bench Area aufhält. Dies soll die Verteidiger zu einer verzögerten Reaktion auf den Pass bewegen. Match officials would spot the ball in the appropriate place for a penalty and play would resume. However, the ball usually pushed to the fourth place of the defending Spile Spilen Kostenlos. A touchdown can be scored by either carrying the ball into the end zone or receiving the ball from a pass whilst in the end zone. It's the ideal start for those who want to get a regulation snapshot of how to play American Football for beginners in the United Kingdom. If it is touched before ten yards, the ball Voodoo Clouds Awakening dead and a re-kick or spot of the ball will be rewarded to the receiving team. Archived from Legacy original on April 27, A touchdown which occurs when an offensive player successfully gets the ball in an opponent end zone or receives the ball by means of a pass while in an opponent end zone results in six points being awarded to the offensive team, plus an opportunity to earn extra Beste Spielothek in Stogl finden by kicking the ball between the upright post to earn extra point. A safety scored on a try play A1 Kroatien worth one point. Retrieved January 20, NAIA organisiert sind. Die kostenlose ran App. Allen defensiven Spielern ist gemein, dass sie Raumgewinn verhindern sollen, indem sie den Ballträger stoppen, Pässe verhindern oder sonst wie TrГјmpfe eingreifen sollen. Das ist nur dann der Fall, wenn: a. Zu Beginn eines solchen Spielzugs versucht der Quarterback in der Regel, einem passberechtigten Spieler den Ball zuzuwerfen.

There are several ways to achieve a touchdown. Players can run with the ball until they get tackled, or they can throw it down field to one of their teammates.

If the pace is a little too fast the section listing 10 basic rules of American Football will slow things down.

The match referee will organise a coin toss with the team captains three minutes before the start of the game. As a rule, the visiting team will call the toss by choosing 'heads or tails'.

Being the winner of the coin toss means you can choose to begin play for the first half or for the second half.

Being the losing captain of the coin toss means your team would get the remaining options. A phase of play begins when the team is in formation with seven players standing on the line of scrimmage.

The line of scrimmage is a 'movable' imaginary line determined by the match officials. As a rule, the center player stands on the line and passes the ball back between his legs to the quarterback.

This is usually called the snap or hiking the ball. The kickoff takes place on a kicking tee at the defense's yard line.

The place-kicker punts the ball down field to the offense players. A kick return man will try to catch the ball and run with it into opposition territory.

Rules of American Football games allow sixty 60 minutes as an allotted time of play. The actual match duration will divide into four 4 quarters.

There will be fifteen 15 minutes of play in each quarter. Players take a two minute break between the 1st and the 2nd quarter, and then again between the 3rd and 4th quarters.

A fifteen minute rest break takes place between the 2nd and the 3rd quarter for half time. NFL rulings permit 53 players to be on the team active roster.

But, only 45 players can dress out for the game. The rules and regulations of American Football allow each team to field no more than eleven 11 players during the game itself.

There are no restrictions on substitutions made between plays. American Football rules and positions generally consist of three different groups of players, such as:.

American Football rules and regulations state all players must wear approved and mandatory safety equipment. Protective gear is part of the American Football equipment list and includes:.

Players must wear proper gear and accessories for a game. Check out the section that lists the equipment used in American Football with detailed descriptions on:.

You move the ball either by throwing it to a teammate or running with it. Each team gets 4 chances downs to progress the ball 10 yards forward.

College football maintained a tradition of postseason bowl games. Each bowl game was associated with a particular conference and earning a spot in a bowl game was the reward for winning a conference.

This arrangement was profitable, but it tended to prevent the two top-ranked teams from meeting in a true national championship game, as they would normally be committed to the bowl games of their respective conferences.

Several systems have been used since to determine a national champion of college football. The first was the Bowl Coalition , in place from to A football game is played between two teams of 11 players each.

Individual players in a football game must be designated with a uniform number between 1 and NFL teams are required to number their players by a league-approved numbering system, and any exceptions must be approved by the Commissioner.

Although the sport is played almost exclusively by men, women are eligible to play in high school, college, and professional football.

No woman has ever played in the NFL, but women have played in high school and college football games. The role of the offensive unit is to advance the football down the field with the ultimate goal of scoring a touchdown.

The offensive team must line up in a legal formation before they can snap the ball. An offensive formation is considered illegal if there are more than four players in the backfield or fewer than five players numbered 50—79 on the offensive line.

Interior offensive linemen are not allowed to move until the snap of the ball. The quarterback is the leader of the offense.

Either the quarterback or a coach calls the plays. Quarterbacks typically inform the rest of the offense of the play in the huddle before the team lines up.

The quarterback lines up behind the center to take the snap and then hands the ball off, throws it or runs with it. The primary role of the halfback, also known as the running back or tailback, is to carry the ball on running plays.

Halfbacks may also serve as receivers. Fullbacks tend to be larger than halfbacks and function primarily as blockers, but they are sometimes used as runners in short-yardage situations [53] and are seldom used in passing situations.

The offensive line OL consists of several players whose primary function is to block members of the defensive line from tackling the ball carrier on running plays or sacking the quarterback on passing plays.

The principal receivers are the wide receivers WR and the tight ends TE. The main goal of the wide receiver is to catch passes thrown by the quarterback, [53] but they may also function as decoys or as blockers during running plays.

Tight ends line up outside the tackles and function both as receivers and as blockers. The role of the defense is to prevent the offense from scoring by tackling the ball carrier or by forcing turnovers interceptions or fumbles.

Defensive ends line up on the ends of the line, while defensive tackles line up inside, between the defensive ends. The primary responsibilities of defensive ends and defensive tackles are to stop running plays on the outside and inside, respectively, to pressure the quarterback on passing plays, and to occupy the line so that the linebackers can break through.

Linebackers line up behind the defensive line but in front of the defensive backfield. Linebackers are the defensive leaders and call the defensive plays.

Their diverse roles include defending the run, pressuring the quarterback, and guarding backs, wide receivers and tight ends in the passing game.

The defensive backfield , often called the secondary, consists of cornerbacks CB and safeties S. Safeties are themselves divided into free safeties FS and strong safeties SS.

Safeties line up between the cornerbacks but farther back in the secondary. Safeties are the last line of defense and are responsible for stopping deep passing plays as well as running plays.

The special teams unit is responsible for all kicking plays. The special teams unit of the team in control of the ball tries to execute field goal FG attempts, punts and kickoffs , while the opposing team's unit will aim to block or return them.

The long snapper's job is to snap the football to the holder, who will catch and position it for the placekicker. There is not usually a holder on kickoffs, because the ball is kicked off a tee; however, a holder may be used in certain situations, such as if wind is preventing the ball from remaining upright on the tee.

The player on the receiving team who catches the ball is known as the kickoff returner KR. The positions specific to punt plays are the punter P , long snapper, upback and gunner.

The long snapper snaps the football directly to the punter, who then drops and kicks it before it hits the ground. Gunners line up split outside the line and race down the field, aiming to tackle the punt returner PR —the player who catches the punt.

Upbacks line up a short distance behind the line of scrimmage, providing additional protection to the punter.

In football, the winner is the team that has scored more points at the end of the game. There are multiple ways to score in a football game. The touchdown TD , worth six points, is the most valuable scoring play in American football.

A touchdown is scored when a live ball is advanced into, caught in, or recovered in the opposing team's end zone. A PAT is most commonly attempted from the two- or three-yard line, depending on the level of play.

If a PAT is scored by a placekick or dropkick through the goal posts, it is worth one point, typically called the extra point.

If it is scored by what would normally be a touchdown it is worth two points, typically called the two-point conversion. In general, the extra point is almost always successful while the two-point conversion is a much riskier play with a higher probability of failure; accordingly, extra point attempts are far more common than two-point conversion attempts.

A field goal FG , worth three points, is scored when the ball is placekicked or dropkicked through the uprights and over the crossbars of the defense's goalposts.

A safety is scored when the ball carrier is tackled in their own end zone. Safeties are worth two points, which are awarded to the defense.

Lines marked along the ends and sides of the field are known as the end lines and sidelines. Goal lines are marked 10 yards 9.

Weighted pylons are placed the sidelines on the inside corner of the intersections with the goal lines and end lines. White markings on the field identify the distance from the end zone.

Inbound lines, or hash marks , are short parallel lines that mark off 1-yard 0. Yard lines , which can run the width of the field, are marked every 5 yards 4.

A one-yard-wide line is placed at each end of the field; this line is marked at the center of the two-yard line in professional play and at the three-yard line in college play.

Numerals that display the distance from the closest goal line in yards are placed on both sides of the field every ten yards. Goalposts are located at the center of the plane of the two end lines.

The crossbar of these posts is 10 feet 3. Goal posts are padded at the base, and orange ribbons are normally placed at the tip of each upright as indicators of wind strength and direction.

The football itself is an oval ball, similar to the balls used in rugby or Australian rules football. Football games last for a total of 60 minutes in professional and college play and are divided into two halves of 30 minutes and four quarters of 15 minutes.

The visiting team can call either "heads" or "tails"; the winner of the toss chooses whether to receive or kick off the ball or which goal they wish to defend.

They can defer their choice until the second half. Unless the winning team decides to defer, the losing team chooses the option the winning team did not select—to receive, kick, or select a goal to defend to begin the second half.

Most teams choose to receive or defer, because choosing to kick the ball to start the game allows the other team to choose which goal to defend.

Games last longer than their defined length due to play stoppages—the average NFL game lasts slightly over three hours. An operator is responsible for starting, stopping and operating the game clock based on the direction of the appropriate official.

If the play clock expires before the ball has been snapped or free-kicked, a delay of game foul is called on the offense. The play clock is set 25 seconds after certain administrative stoppages in play and to 40 seconds when play is proceeding without such stoppages.

There are two main ways the offense can advance the ball: running and passing. In a typical play, the center passes the ball backwards and between their legs to the quarterback in a process known as the snap.

The quarterback then either hands the ball off to a back, throws the ball, or runs with it. The play ends when the player with the ball is tackled or goes out-of-bounds or a pass hits the ground without a player having caught it.

A forward pass can be legally attempted only if the passer is behind the line of scrimmage; only one forward pass can be attempted per down. The offense is given a series of four plays, known as downs.

If the offense advances ten or more yards in the four downs, they are awarded a new set of four downs.

If they fail to advance ten yards, possession of the football is turned over to the defense. In most situations, if the offense reaches their fourth down they will punt the ball to the other team, which forces them to begin their drive from farther down the field; if they are in field goal range , they might attempt to score a field goal instead.

There are two categories of kicks in football: scrimmage kicks, which can be executed by the offensive team on any down from behind or on the line of scrimmage, [95] [96] [97] and free kicks.

On a kickoff, the ball is placed at the yard line of the kicking team in professional and college play and at the yard line in high school play.

The ball may be drop-kicked or place-kicked. If a place kick is chosen, the ball can be placed on the ground or a tee; a holder may be used in either case.

On a safety kick, the kicking team kicks the ball from their own yard line. They can punt, drop-kick or place-kick the ball, but a tee may not be used in professional play.

Any member of the receiving team may catch or advance the ball. The ball may be recovered by the kicking team once it has gone at least ten yards and has touched the ground or has been touched by any member of the receiving team.

The three types of scrimmage kicks are place kicks, drop kicks, and punts. Only place kicks and drop kicks can score points.

If it is touched or recovered by the kicking team beyond this line, it becomes dead at the spot where it was touched. The receiving team has the option of signaling for a fair catch , which prohibits the defense from blocking into or tackling the receiver.

The play ends as soon as the ball is caught and the ball may not be advanced. Officials are responsible for enforcing game rules and monitoring the clock.

All officials carry a whistle and wear black-and-white striped shirts and black hats except for the referee, whose hat is white.

Each carries a weighted yellow flag that is thrown to the ground to signal that a foul has been called. An official who spots multiple fouls will throw their hat as a secondary signal.

Another set of officials, the chain crew , are responsible for moving the chains. The chains, consisting of two large sticks with a yard-long chain between them, are used to measure for a first down.

The chain crew stays on the sidelines during the game, but if requested by the officials they will briefly bring the chains on to the field to measure.

A typical chain crew will have at least three people—two members of the chain crew will hold either of the two sticks, while a third will hold the down marker.

The down marker, a large stick with a dial on it, is flipped after each play to indicate the current down and is typically moved to the approximate spot of the ball.

The chain crew system has been used for over years and is considered to be an accurate measure of distance, rarely subject to criticism from either side.

Football is a full-contact sport, and injuries are relatively common. Most injuries occur during training sessions, particularly ones that involve contact between players.

At a minimum players must wear a football helmet and a set of shoulder pads , but individual leagues may require additional padding such as thigh pads and guards, knee pads, chest protectors, and mouthguards.

The most common types of injuries are strains , sprains , bruises , fractures, dislocations , and concussions. Repeated concussions and possibly sub-concussive head impacts [] can increase a person's risk in later life for CTE chronic traumatic encephalopathy and mental health issues such as dementia , Parkinson's disease , and depression.

A study performed by the VA Boston Healthcare System and the Boston University School of Medicine found that tackle football before age 12 was correlated with earlier onset of symptoms of CTE, but not with symptom severity.

More specifically, each year a player played tackle football under age 12 predicted earlier onset of cognitive, behavioral, and mood problems by an average of two and a half years.

College football is the third-most popular sport in the United States, behind professional baseball and professional football. High school football is the most popular sport in the United States played by boys; over 1.

The NFHS is the largest organization for high school football, with member associations in all 50 states as well as the District of Columbia.

USA Football is the governing body for youth and amateur football, [] and Pop Warner Little Scholars is the largest organization for youth football.

Several professional football leagues have been formed outside the auspices of the NFL. One such league, the XFL , is currently operating as of Other attempts to start rival leagues since the AFL merged with the NFL in have been far less successful, as professional football salaries and the NFL's television contracts began to escalate out of the reach of competitors and the NFL covered more of the larger cities.

The World Football League WFL played for two seasons, in and , but faced such severe monetary issues it could not pay its players. In its second and final season the WFL attempted to establish a stable credit rating, but the league disbanded before the season could be completed.

Originally not intended as a rival league, the entry of owners who sought marquee talent and to challenge the NFL led to an escalation in salaries and ensuing financial losses.

Despite television contracts with NBC and UPN , and high expectations, the XFL suffered from low quality of play and poor reception for its use of tawdry professional wrestling gimmicks , which caused initially high ratings and attendance to collapse.

The United Football League UFL began in but folded after suspending its season amid declining interest and lack of major television coverage.

American football leagues exist throughout the world, but the game has yet to achieve the international success and popularity of baseball and basketball.

These countries rank far below the United States, which is dominant at the international level. The league operates in a promotion and relegation structure with German Football League 2 GFL2 , which also has 16 teams.

The competition is contested between the top six European teams. American football federations are present in Africa , the Americas , Asia , Europe and Oceania ; a total of 64 national football federations exist as of July These include the predominant participation of men in international play and the short three-week Olympic schedule.

Large team sizes are an additional difficulty, due to the Olympics' set limit of 10, athletes and coaches.

American football also has an issue with a lack of global visibility. Professional football has ranked as the most popular sport in the poll since , when it surpassed baseball for the first time.

In a study, the NCAA estimated there were around 1. American football also plays a significant role in American culture.

The day on which the Super Bowl is held is considered a de facto national holiday , [] and in parts of the country like Texas , the sport has been compared to a religion.

Merit is rewarded, not punished. Masculinity is celebrated, not feminized. People of various beliefs and backgrounds — a melting pot, if you will — must unify for a common goal for the team to be successful".

The safety of the sport has also sparked national controversy in American popular culture. It is often received as "overly aggressive", and defamiliarized in popular culture.

Bennet Omalu , a neuropathologist who was the first to discover and publish findings of chronic traumatic encephalopathy or CTE.

In Canada, the game has a significant following. It was the second-most popular sport in Mexico in the s, with the game being particularly popular in colleges.

Japan was introduced to the sport in by Paul Rusch , a teacher and Christian missionary who helped to establish football teams at three universities in Tokyo.

Play was halted during World War II, but the sport began growing in popularity again after the war. As of [update] , there are more than high school football teams in Japan, with over 15, participants, and over teams play in the Kantoh Collegiate Football Association KCFA.

Europe is a major target for the expansion of the game by football organizers. In the United Kingdom in the s, the sport was popular, with the Super Bowl being watched by over four million people about 1 out of every 14 Britons.

Its popularity faded during the s, coinciding with the establishment of the Premier League —top level of the English football league system.

According to BBC America , there is a "social stigma" surrounding American football in the UK, with many Brits feeling the sport has no right to call itself "football" due to the lack of emphasis on kicking.

Super Bowl viewership has also rebounded, with over 4. In Brazil , football is a growing sport. It was generally unknown there until the s when a small group of players began playing on Copacabana Beach in Rio de Janeiro.

The sport grew gradually with amateur players registering within 20 years. Games were played on the beach with modified rules and without the traditional football equipment due to its lack of availability in Brazil.

Eventually, a tournament, the Carioca championship, was founded, with the championship Carioca Bowl played to determine a league champion.

The country saw its first full-pad game of football in October The sport's increase in popularity has been attributed to games aired on ESPN , which began airing in Brazil in with Portuguese commentary.

The network, along with Esporte Interativo , airs games there on cable television. Football is often associated in Brazil as being the sport of supermodel Gisele Bündchen 's husband Tom Brady.

The NFL has expressed interest in having games in the country, and the Super Bowl has become a widely watched event in Brazil at bars and movie theaters.

Canadian football , the predominant form of football in Canada, is closely related to American football—both sports developed from rugby and are considered to be the chief variants of gridiron football.

Indoor football leagues constitute what The New York Times writer Mike Tanier described as the "most minor of minor leagues.

The Indoor Football League is an example of a prominent indoor league. There are several non-contact variants of football like flag football. Depending on the rules used, a game of touch football may require the player be touched with either one or two hands to be considered down.

From Wikipedia, the free encyclopedia. Team field sport. This article is about the American variation of gridiron football.

For other uses, see American football disambiguation. Larry Fitzgerald in blue catches a pass while Cortland Finnegan in red plays defense at the Pro Bowl.

Football gridiron. Team sport ball game. The object of American football is to score more points than your opponents in the allotted time.

This can be achieved by either throwing the ball to a teammate or running with the ball. Each team gets 4 chances downs to move the ball 10 yards forward.

Once they pass the 10 yards their downs reset and they start again for another 10 yards. After 4 downs have passed and they have failed to make it over the 10 yards required the ball will be turned over to the defensive team.

Whilst there are only 11 players from each team on the field at any team, an American football team is actually made up of 45 players.

The teams are generally split into three groups of attacking generally smaller, stronger, faster type of players, including a quarterback who is said to run the attacking plays and throw the ball to their teammates , defence larger, more powerful players designed to stop players from running and special team players responsible for the kicking and punting side of the game with a mixture of larger and faster players.

American Football Rules

American Football Rules Video

Rules of American Football : American Football Rules for Beginners : How to play American Football? Im Anschluss an einen Punt wechselt in Neymar Psg Transfer Regel der Ballbesitz. Zumeist kommt es infolge eines Fumbles gleich zu einem Turnover, was bedeutet: Die gegnerische Mannschaft ist am Zug. Anders als Beste Spielothek in Sandersleben finden Interception zieht dies keinen Ballverlust nach sich. Die Angriffe werden schnellstens vorangetrieben. Bei einem Holding durch einen Offensivspieler Beste Spielothek in Reichenthal finden es eine Raumstrafe von 10 Yards. Down Ein Down ist nichts anderes als ein Spielzug. Aus diesem Grund wird der vierte Versuch nur selten ausgespielt und stattdessen ein Punt oder Fieldgoalversuch durchgeführt, um dem Gegner nicht mehr Raum zu überlassen als nötig. Pro Spielzug ist nur ein Vorwärtspass erlaubt. Schweizerischer American Football Verband (SAFV). The Football Book: The Teams, The Rules, The Leagues, The Tactics (Dk). 1. November von DK.

This can be achieved by either throwing the ball to a teammate or running with the ball. Each team gets 4 chances downs to move the ball 10 yards forward.

Once they pass the 10 yards their downs reset and they start again for another 10 yards. After 4 downs have passed and they have failed to make it over the 10 yards required the ball will be turned over to the defensive team.

Whilst there are only 11 players from each team on the field at any team, an American football team is actually made up of 45 players. The teams are generally split into three groups of attacking generally smaller, stronger, faster type of players, including a quarterback who is said to run the attacking plays and throw the ball to their teammates , defence larger, more powerful players designed to stop players from running and special team players responsible for the kicking and punting side of the game with a mixture of larger and faster players.

An American football field is generally around yards long and yards wide. Lines are drawn on the field at 10 yard interval to indicate how far each team has to go before reaching the end zone.

The end zones are added at each end of the pitch and are roughly 20 yards in length each. Posts can also be found at each end of which the kicker kicks the ball over.

When a player scores a touchdown six points are awarded to their team. It could, however, be kicked or batted with the feet, hands, head or sides, with the objective being to advance it into the opponent's goal.

Rutgers won the game 6—4. Representatives of Yale, Columbia , Princeton and Rutgers met on October 19, , to create a standard set of rules for use by all schools.

Harvard abstained from the conference, as they favored a rugby-style game that allowed running with the ball. An Harvard—Yale game played under rugby-style rules was observed by two Princeton athletes who were impressed by it.

They introduced the sport to Princeton, a feat the Professional Football Researchers Association compared to "selling refrigerators to Eskimos ".

Yale player Walter Camp , now regarded as the "Father of American Football", [13] [14] secured rule changes in that reduced the size of each team from 15 to 11 players and instituted the snap to replace the chaotic and inconsistent scrum.

The introduction of the snap resulted in an unexpected consequence. Prior to the snap, the strategy had been to punt if a scrum resulted in bad field position.

However, a group of Princeton players realized that as the snap was uncontested, they could now hold the ball indefinitely to prevent their opponent from scoring.

In , in a game between Yale and Princeton, both teams used this strategy to maintain their undefeated records. Each team held the ball, gaining no ground, for an entire half, resulting in a 0—0 tie.

This "block game" proved extremely unpopular with both teams' spectators and fans. A rule change was necessary to prevent this strategy from taking hold, and a reversion to the scrum was considered.

However, Camp successfully proposed a rule in that limited each team to three downs , or tackles, to advance the ball 5 yards 4.

Failure to advance the ball the required distance within those three downs would result in control of the ball being forfeited to the other team.

This change effectively made American football a separate sport from rugby, and the resulting five-yard lines added to the field to measure distances made it resemble a gridiron in appearance.

Additionally, tackling below the waist was legalized, [13] and a static line of scrimmage was instituted.

Despite these new rules, football remained a violent sport. Dangerous mass-formations like the flying wedge resulted in serious injuries and deaths.

The legal forward pass was introduced in , although its impact was initially minimal due to the restrictions placed on its use.

The idea of a yard-wider field was opposed by Harvard due to the size of the new Harvard Stadium. To reduce infighting and dirty play between teams, the neutral zone was created along the width of the football before the snap.

This is the first recorded instance of a player being paid to participate in a game of American football , although many athletic clubs in the s offered indirect benefits, such as helping players attain employment, giving out trophies or watches that players could pawn for money, or paying double in expense money.

Despite these extra benefits, the game had a strict sense of amateurism at the time, and direct payment to players was frowned upon, if not prohibited outright.

Over time, professional play became increasingly common, and with it came rising salaries and unpredictable player movement, as well as the illegal payment of college players who were still in school.

The National Football League NFL , a group of professional teams that was originally established in as the American Professional Football Association, aimed to solve these problems.

This new league's stated goals included an end to bidding wars over players, prevention of the use of college players, and abolition of the practice of paying players to leave another team.

The dominant form of football at the time was played at the collegiate level. The game, a 23—17 overtime victory by the Colts, was seen by millions of television viewers and had a major impact on the popularity of the sport.

This, along with the innovations introduced by the new American Football League AFL in the early s, helped football to become the most popular sport in the United States by the mids.

The AFL began in relative obscurity but eventually thrived, with an initial television contract with the ABC television network. Meanwhile, the AFL introduced many new features to professional football in the United States: official time was kept on a scoreboard clock rather than on a watch in the referee's pocket, as the NFL did; optional two-point conversions by pass or run after touchdowns; names on the jerseys of players; and several others, including expansion of the role of minority players, actively recruited by the league in contrast to the NFL.

The bidding war for players ended in when NFL owners approached the AFL regarding a merger, and the two leagues agreed on one that took full effect in This agreement provided for a common draft that would take place each year, and it instituted an annual World Championship game to be played between the champions of each league.

This championship game began play at the end of the season. Once the merger was completed, it was no longer a championship game between two leagues and reverted to the NFL championship game, which came to be known as the Super Bowl.

College football maintained a tradition of postseason bowl games. Each bowl game was associated with a particular conference and earning a spot in a bowl game was the reward for winning a conference.

This arrangement was profitable, but it tended to prevent the two top-ranked teams from meeting in a true national championship game, as they would normally be committed to the bowl games of their respective conferences.

Several systems have been used since to determine a national champion of college football. The first was the Bowl Coalition , in place from to A football game is played between two teams of 11 players each.

Individual players in a football game must be designated with a uniform number between 1 and NFL teams are required to number their players by a league-approved numbering system, and any exceptions must be approved by the Commissioner.

Although the sport is played almost exclusively by men, women are eligible to play in high school, college, and professional football. No woman has ever played in the NFL, but women have played in high school and college football games.

The role of the offensive unit is to advance the football down the field with the ultimate goal of scoring a touchdown. The offensive team must line up in a legal formation before they can snap the ball.

An offensive formation is considered illegal if there are more than four players in the backfield or fewer than five players numbered 50—79 on the offensive line.

Interior offensive linemen are not allowed to move until the snap of the ball. The quarterback is the leader of the offense.

Either the quarterback or a coach calls the plays. Quarterbacks typically inform the rest of the offense of the play in the huddle before the team lines up.

The quarterback lines up behind the center to take the snap and then hands the ball off, throws it or runs with it. The primary role of the halfback, also known as the running back or tailback, is to carry the ball on running plays.

Halfbacks may also serve as receivers. Fullbacks tend to be larger than halfbacks and function primarily as blockers, but they are sometimes used as runners in short-yardage situations [53] and are seldom used in passing situations.

The offensive line OL consists of several players whose primary function is to block members of the defensive line from tackling the ball carrier on running plays or sacking the quarterback on passing plays.

The principal receivers are the wide receivers WR and the tight ends TE. The main goal of the wide receiver is to catch passes thrown by the quarterback, [53] but they may also function as decoys or as blockers during running plays.

Tight ends line up outside the tackles and function both as receivers and as blockers. The role of the defense is to prevent the offense from scoring by tackling the ball carrier or by forcing turnovers interceptions or fumbles.

Defensive ends line up on the ends of the line, while defensive tackles line up inside, between the defensive ends. The primary responsibilities of defensive ends and defensive tackles are to stop running plays on the outside and inside, respectively, to pressure the quarterback on passing plays, and to occupy the line so that the linebackers can break through.

Linebackers line up behind the defensive line but in front of the defensive backfield. Linebackers are the defensive leaders and call the defensive plays.

Their diverse roles include defending the run, pressuring the quarterback, and guarding backs, wide receivers and tight ends in the passing game.

The defensive backfield , often called the secondary, consists of cornerbacks CB and safeties S. Safeties are themselves divided into free safeties FS and strong safeties SS.

Safeties line up between the cornerbacks but farther back in the secondary. Safeties are the last line of defense and are responsible for stopping deep passing plays as well as running plays.

The special teams unit is responsible for all kicking plays. The special teams unit of the team in control of the ball tries to execute field goal FG attempts, punts and kickoffs , while the opposing team's unit will aim to block or return them.

The long snapper's job is to snap the football to the holder, who will catch and position it for the placekicker. There is not usually a holder on kickoffs, because the ball is kicked off a tee; however, a holder may be used in certain situations, such as if wind is preventing the ball from remaining upright on the tee.

The player on the receiving team who catches the ball is known as the kickoff returner KR. The positions specific to punt plays are the punter P , long snapper, upback and gunner.

The long snapper snaps the football directly to the punter, who then drops and kicks it before it hits the ground. Gunners line up split outside the line and race down the field, aiming to tackle the punt returner PR —the player who catches the punt.

Upbacks line up a short distance behind the line of scrimmage, providing additional protection to the punter.

In football, the winner is the team that has scored more points at the end of the game. There are multiple ways to score in a football game.

The touchdown TD , worth six points, is the most valuable scoring play in American football. A touchdown is scored when a live ball is advanced into, caught in, or recovered in the opposing team's end zone.

A PAT is most commonly attempted from the two- or three-yard line, depending on the level of play. If a PAT is scored by a placekick or dropkick through the goal posts, it is worth one point, typically called the extra point.

If it is scored by what would normally be a touchdown it is worth two points, typically called the two-point conversion. In general, the extra point is almost always successful while the two-point conversion is a much riskier play with a higher probability of failure; accordingly, extra point attempts are far more common than two-point conversion attempts.

A field goal FG , worth three points, is scored when the ball is placekicked or dropkicked through the uprights and over the crossbars of the defense's goalposts.

A safety is scored when the ball carrier is tackled in their own end zone. Safeties are worth two points, which are awarded to the defense. Lines marked along the ends and sides of the field are known as the end lines and sidelines.

Goal lines are marked 10 yards 9. Weighted pylons are placed the sidelines on the inside corner of the intersections with the goal lines and end lines.

White markings on the field identify the distance from the end zone. Inbound lines, or hash marks , are short parallel lines that mark off 1-yard 0.

Yard lines , which can run the width of the field, are marked every 5 yards 4. A one-yard-wide line is placed at each end of the field; this line is marked at the center of the two-yard line in professional play and at the three-yard line in college play.

Numerals that display the distance from the closest goal line in yards are placed on both sides of the field every ten yards.

Goalposts are located at the center of the plane of the two end lines. The crossbar of these posts is 10 feet 3.

Goal posts are padded at the base, and orange ribbons are normally placed at the tip of each upright as indicators of wind strength and direction.

The football itself is an oval ball, similar to the balls used in rugby or Australian rules football. Football games last for a total of 60 minutes in professional and college play and are divided into two halves of 30 minutes and four quarters of 15 minutes.

The visiting team can call either "heads" or "tails"; the winner of the toss chooses whether to receive or kick off the ball or which goal they wish to defend.

They can defer their choice until the second half. Unless the winning team decides to defer, the losing team chooses the option the winning team did not select—to receive, kick, or select a goal to defend to begin the second half.

Most teams choose to receive or defer, because choosing to kick the ball to start the game allows the other team to choose which goal to defend.

Games last longer than their defined length due to play stoppages—the average NFL game lasts slightly over three hours.

An operator is responsible for starting, stopping and operating the game clock based on the direction of the appropriate official. If the play clock expires before the ball has been snapped or free-kicked, a delay of game foul is called on the offense.

The play clock is set 25 seconds after certain administrative stoppages in play and to 40 seconds when play is proceeding without such stoppages.

There are two main ways the offense can advance the ball: running and passing. In a typical play, the center passes the ball backwards and between their legs to the quarterback in a process known as the snap.

The quarterback then either hands the ball off to a back, throws the ball, or runs with it. The play ends when the player with the ball is tackled or goes out-of-bounds or a pass hits the ground without a player having caught it.

A forward pass can be legally attempted only if the passer is behind the line of scrimmage; only one forward pass can be attempted per down.

The offense is given a series of four plays, known as downs. If the offense advances ten or more yards in the four downs, they are awarded a new set of four downs.

If they fail to advance ten yards, possession of the football is turned over to the defense. In most situations, if the offense reaches their fourth down they will punt the ball to the other team, which forces them to begin their drive from farther down the field; if they are in field goal range , they might attempt to score a field goal instead.

There are two categories of kicks in football: scrimmage kicks, which can be executed by the offensive team on any down from behind or on the line of scrimmage, [95] [96] [97] and free kicks.

On a kickoff, the ball is placed at the yard line of the kicking team in professional and college play and at the yard line in high school play.

The ball may be drop-kicked or place-kicked. If a place kick is chosen, the ball can be placed on the ground or a tee; a holder may be used in either case.

On a safety kick, the kicking team kicks the ball from their own yard line. They can punt, drop-kick or place-kick the ball, but a tee may not be used in professional play.

Any member of the receiving team may catch or advance the ball. The ball may be recovered by the kicking team once it has gone at least ten yards and has touched the ground or has been touched by any member of the receiving team.

The three types of scrimmage kicks are place kicks, drop kicks, and punts. Only place kicks and drop kicks can score points.

If it is touched or recovered by the kicking team beyond this line, it becomes dead at the spot where it was touched.

The receiving team has the option of signaling for a fair catch , which prohibits the defense from blocking into or tackling the receiver.

The play ends as soon as the ball is caught and the ball may not be advanced. Officials are responsible for enforcing game rules and monitoring the clock.

All officials carry a whistle and wear black-and-white striped shirts and black hats except for the referee, whose hat is white.

Each carries a weighted yellow flag that is thrown to the ground to signal that a foul has been called. An official who spots multiple fouls will throw their hat as a secondary signal.

Another set of officials, the chain crew , are responsible for moving the chains. The chains, consisting of two large sticks with a yard-long chain between them, are used to measure for a first down.

The chain crew stays on the sidelines during the game, but if requested by the officials they will briefly bring the chains on to the field to measure.

A typical chain crew will have at least three people—two members of the chain crew will hold either of the two sticks, while a third will hold the down marker.

The down marker, a large stick with a dial on it, is flipped after each play to indicate the current down and is typically moved to the approximate spot of the ball.

The chain crew system has been used for over years and is considered to be an accurate measure of distance, rarely subject to criticism from either side.

Football is a full-contact sport, and injuries are relatively common. Most injuries occur during training sessions, particularly ones that involve contact between players.

At a minimum players must wear a football helmet and a set of shoulder pads , but individual leagues may require additional padding such as thigh pads and guards, knee pads, chest protectors, and mouthguards.

The most common types of injuries are strains , sprains , bruises , fractures, dislocations , and concussions. Repeated concussions and possibly sub-concussive head impacts [] can increase a person's risk in later life for CTE chronic traumatic encephalopathy and mental health issues such as dementia , Parkinson's disease , and depression.

A study performed by the VA Boston Healthcare System and the Boston University School of Medicine found that tackle football before age 12 was correlated with earlier onset of symptoms of CTE, but not with symptom severity.

More specifically, each year a player played tackle football under age 12 predicted earlier onset of cognitive, behavioral, and mood problems by an average of two and a half years.

College football is the third-most popular sport in the United States, behind professional baseball and professional football.

High school football is the most popular sport in the United States played by boys; over 1. The NFHS is the largest organization for high school football, with member associations in all 50 states as well as the District of Columbia.

USA Football is the governing body for youth and amateur football, [] and Pop Warner Little Scholars is the largest organization for youth football.

Several professional football leagues have been formed outside the auspices of the NFL. One such league, the XFL , is currently operating as of Other attempts to start rival leagues since the AFL merged with the NFL in have been far less successful, as professional football salaries and the NFL's television contracts began to escalate out of the reach of competitors and the NFL covered more of the larger cities.

The World Football League WFL played for two seasons, in and , but faced such severe monetary issues it could not pay its players.

In its second and final season the WFL attempted to establish a stable credit rating, but the league disbanded before the season could be completed.

Originally not intended as a rival league, the entry of owners who sought marquee talent and to challenge the NFL led to an escalation in salaries and ensuing financial losses.

Despite television contracts with NBC and UPN , and high expectations, the XFL suffered from low quality of play and poor reception for its use of tawdry professional wrestling gimmicks , which caused initially high ratings and attendance to collapse.

The United Football League UFL began in but folded after suspending its season amid declining interest and lack of major television coverage. American football leagues exist throughout the world, but the game has yet to achieve the international success and popularity of baseball and basketball.

These countries rank far below the United States, which is dominant at the international level. The league operates in a promotion and relegation structure with German Football League 2 GFL2 , which also has 16 teams.

The competition is contested between the top six European teams. American football federations are present in Africa , the Americas , Asia , Europe and Oceania ; a total of 64 national football federations exist as of July These include the predominant participation of men in international play and the short three-week Olympic schedule.

Large team sizes are an additional difficulty, due to the Olympics' set limit of 10, athletes and coaches. American football also has an issue with a lack of global visibility.

Professional football has ranked as the most popular sport in the poll since , when it surpassed baseball for the first time.

In a study, the NCAA estimated there were around 1. American football also plays a significant role in American culture. The day on which the Super Bowl is held is considered a de facto national holiday , [] and in parts of the country like Texas , the sport has been compared to a religion.

Merit is rewarded, not punished. Masculinity is celebrated, not feminized. People of various beliefs and backgrounds — a melting pot, if you will — must unify for a common goal for the team to be successful".

The safety of the sport has also sparked national controversy in American popular culture. It is often received as "overly aggressive", and defamiliarized in popular culture.

Bennet Omalu , a neuropathologist who was the first to discover and publish findings of chronic traumatic encephalopathy or CTE.

In Canada, the game has a significant following. It was the second-most popular sport in Mexico in the s, with the game being particularly popular in colleges.

Japan was introduced to the sport in by Paul Rusch , a teacher and Christian missionary who helped to establish football teams at three universities in Tokyo.

Play was halted during World War II, but the sport began growing in popularity again after the war. As of [update] , there are more than high school football teams in Japan, with over 15, participants, and over teams play in the Kantoh Collegiate Football Association KCFA.

Europe is a major target for the expansion of the game by football organizers. In the United Kingdom in the s, the sport was popular, with the Super Bowl being watched by over four million people about 1 out of every 14 Britons.

Its popularity faded during the s, coinciding with the establishment of the Premier League —top level of the English football league system.

According to BBC America , there is a "social stigma" surrounding American football in the UK, with many Brits feeling the sport has no right to call itself "football" due to the lack of emphasis on kicking.

Super Bowl viewership has also rebounded, with over 4. In Brazil , football is a growing sport. It was generally unknown there until the s when a small group of players began playing on Copacabana Beach in Rio de Janeiro.

The sport grew gradually with amateur players registering within 20 years. Games were played on the beach with modified rules and without the traditional football equipment due to its lack of availability in Brazil.

Eventually, a tournament, the Carioca championship, was founded, with the championship Carioca Bowl played to determine a league champion.

The country saw its first full-pad game of football in October The sport's increase in popularity has been attributed to games aired on ESPN , which began airing in Brazil in with Portuguese commentary.

The network, along with Esporte Interativo , airs games there on cable television. Football is often associated in Brazil as being the sport of supermodel Gisele Bündchen 's husband Tom Brady.

The NFL has expressed interest in having games in the country, and the Super Bowl has become a widely watched event in Brazil at bars and movie theaters.

Canadian football , the predominant form of football in Canada, is closely related to American football—both sports developed from rugby and are considered to be the chief variants of gridiron football.

Indoor football leagues constitute what The New York Times writer Mike Tanier described as the "most minor of minor leagues. The Indoor Football League is an example of a prominent indoor league.

There are several non-contact variants of football like flag football. Depending on the rules used, a game of touch football may require the player be touched with either one or two hands to be considered down.

From Wikipedia, the free encyclopedia. Team field sport. This article is about the American variation of gridiron football. For other uses, see American football disambiguation.

Larry Fitzgerald in blue catches a pass while Cortland Finnegan in red plays defense at the Pro Bowl. Football gridiron.

Team sport ball game. Football Football helmet Pads shoulder , thigh, knee , and optionally elbow pads. Main article: Football word.

Main article: History of American football. Main article: American football positions. Main article: American football rules.

Main article: American football field. See also: Official American football , Chain crew , and Penalty gridiron football.

See also: Protective equipment in gridiron football and Health issues in American football. Main article: American football in the United States.

See also: Canadian football , Arena football , and Flag football. American football portal. American football strategy Comparison of American football and rugby union Comparison of American football and rugby league Fantasy football American List of American football players List of American football stadiums by capacity List of leagues of American and Canadian football Steroid use in American football.

Pro Football Talk. NBC Sports. Archived from the original on December 30, Retrieved January 14, Britannica Online Encyclopedia.

Archived from the original on June 14, Retrieved July 13, What's In A Name? Retrieved April 19, BBC News. Archived from the original on June 9, Retrieved June 28, Australian Broadcasting Company.

Archived from the original on October 28, September Archived from the original on March 1, Rutgers University. Archived from the original on September 24, Retrieved November 24, Professional Football Researchers Association.

Archived PDF from the original on April 2, Archived from the original on October 9, Retrieved October 8, Archived from the original on June 29, Archived PDF from the original on January 18, Archived from the original on January 2, New England Historical Society.

Archived from the original on October 26, Retrieved January 3, As a senior at Yale, Camp prevailed at Massasoit House and cut the number of players to 11 from That year [] he also came up with the idea for a static line of scrimmage.

The Research Quarterly. National Collegiate Athletic Association. Archived from the original on April 30, New York Times. Retrieved April 12, The Coffin Corner.

Archived from the original PDF on September 28, Retrieved November 25, Archived from the original on January 15,

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