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American football is a sport team which was born in the USA .
The National Football League was the professional league with more audience .
The football championship are held in various parts of the world .
In the USA it has been in the National Football League since 1922 .
In the United States spread rugby that originated from the American Football .
In 1880 Whalter Camp introduced the grid for the start of each game.
Matches are played by two teams with eleven players head .
The most important role is played by the quarterback with its launches should
help the team win .The games lasts 60 minutes divided into four times 15
minutes each .
The range consist of 2 doors that are located at the ends of the playing field .
The lines which indicate Yards are arranged transversely to the field and the
ball used is oval .
The aim of the game is to conquer the territory : advancig on several
occasions on the lines players must reach the goal of opponents, put the
ball and score the touchdown .
The ultimate goal is to achieve more points than the opposing team .
Points can be scored by players in attack by kicking the ball over the end
zone between the two poles that mark the goal (field goal ) .
Even the defenders can achive points , blocking the movements of
opponents in their area of half or bringing the ball into touchdowns .
The Kick-off is done at the beginning of the two times and after each
Attempts to reach the goal are called «downs» .
The beginning of the action is when the ball is passed from the center to the
quarterback . The ball can move in two ways , led by a player in the running
or launched forward with a pass .
1.Center : he is the player who is at the center of the line of attack and that puts
the ball in play .
2. Quarterback : he gives the order to start action and coordinates the team
play on offense .
3.Tight end : he receives the lauches and blocks opponents .
4.Running back : he starts from behind the line of attack whit the ball .
5. Wide receiver : he must receive steps away and anticipate the offensive
action of the opponents .
1. Defensive Tackle : he stops the race opponents .
2. Linebacker : he follows and blocks the action of running , defends
the steps of opponents and disrupts the action of launch.
3. Cornerback : he defends the outer sides of the field from the steps of
the opponent .
4. Free Safety : he follows the receiver opponents and plate them .
The football girls is practiced at a competive level in the United States and
other countries . In some cases , players have been included in the men’s
team particulary in the US Collegiate Championships .
The first championship since 1965 when the Women's Professional
Football League was founded.
The highest-rated North America league is now the Independent Women’s
Football League , founded in 2000, with teams in the United States of
America and Canada .