Yes, they do that to cut weight if they are over, but they run all the time for practice because they must be conditioned because if they arent, its game over. I ran from July to December for Football, to make sure I could go 6 quaters without being tired. I also lifted and had a different diet when I played.
Lower weight, not light weight, and high reps tear your muscle differently then massive weight at low reps.
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2/20/2013: They Day the ****s Stopped
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