NFL football positions carry specific responsibilities ranging from offensive line to special teams. Learn the official size of an NFL football and the health benefits of playing this high-impact sport.
A hockey puck can scorch across the ice at 110 mph, as measured by all-star contests in 2011 in the U.S. and Russia. The fastest pitchers can launch a baseball at 105 mph, as the Cincinnati Reds' Aroldis Chapman managed in September 2010.
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Football plays are not designed to be easily read -- if you can read them in the stands or in front of the TV, so can the defense. Teams that provide obvious clues to their plays end up struggling for yardage, and the offensive coordinator’s job ends up on the line.
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