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American Football is the most popular sport in the United States with its global appeal quickly growing year by year. The game is played across a 100-yard field by two teams of 11 on-field players, which strive to outscore each other and claim as many points as possible. In the NFL, squads of up to 53 players make up each side's offensive, defensive and special teams units - which each take turns on the field during a game. The main aim of American Football is to move the ball into the opponent's end zone. This is typically achieved by rushing or throwing the ball across a series of plays. The offence must move the ball at least 10 yards every four plays in order to retain possession. With every 10-yard gain or more, the offence is awarded another four plays closer to their opponents end zone. Should the defensive team prevent their opponents from making up these yards, the offensive team must punt possession of the ball to the opposition. Should the offensive team be close enough to the goal they may attempt a field goal kick, in which a kicker tries to kick the ball between the goal crossbars to claim three points. After four 15-minute periods the team with the most points wins the game.