Football. Saturday , April 14th , 2018 - 01:47:02 AM
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.
To reduce infighting and dirty play between teams, the neutral zone was created along the width of the football. Scoring was also adjusted: field goals were lowered to three points in 1909 and touchdowns were raised to six points in 1912.The field was also reduced to 100 yards (91 m) long, but two 10-yard-long end zones were created, and teams were given four downs instead of three to advance the ball 10 yards (9.1 m).
During the latter half of the 1870s, colleges playing association football switched to the Rugby Union code, which allowed carrying the ball. A set of rule changes drawn up from 1880 onward by Walter Camp, the "Father of American Football", established the snap, eleven-player teams, and the concept of downs; later rule changes legalized the forward pass, created the neutral zone, and specified the size and shape of the football.
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