Well, when i watch football and basketball, players are in and out all the time. Unless you're Kobi Bryant or Allen Iverson, you are in and out a bunch and have half times. Punters and kickers in football aren't in that often. Most football players don't play both sides of the ball. Some only play special teams. Hockey teams change their lines every three minutes or so, and those guys sit next to the ice while they're out for six minutes. Those other sports also involve much more contact.
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