Association Football

American football, referred to as football in the United States and Canada, and also identified as gridiron, is a sport played by two teams of eleven players on a rectangular field with goalposts at each end. The National Football League , the most common American football league, has the highest average attendance of any sports league in the world its championship game, the Super Bowl , ranks amongst the most-watched club sporting events in the world, and the league has an annual revenue of about US$ten billion. He watches play along the line of scrimmage to make confident that no much more than 11 offensive players are on the field prior to the snap and that no offensive linemen are illegally downfield on pass plays. Football games are played on a rectangular field that measures 120 yards (110 m) extended and 53.33 yards (48.76 m) wide.

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