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introduction

american football is agameplayedonarectangular field by two opposing teams with an inflated leather ball that is roughly oval in shape. the object of the game is to score points by carrying the ball across the opponents goal line or by kicking the ball through the opponents goal posts. football is considered a full-contact sport, meaning that play involves bodily contact by way of checking, blocking, grabbing, and tackling. because of the rough physical nature of the game, playing football can cause injuries.
americanfootballisa distinct type of football that developed in the united states in the 19th century. it developed from soccer association football and rugby football. american football differs slightly in rules and field size from a style of football played mostly in canada, called...