This is very true.
"Yours truly always breathes a sigh of relief when the teams get out of camp and preseason without an injury rash, because I think there's actually less chance of severe injuries in the full-tilt environment of the games that count. Somehow in training camp and the exhibition contests, we lose the gentlemen who weren't in proper shape, who had a physical problem to be exposed or who were fated, by the football gods, to suffer injury. Plus there's the preseason problem of some players going all-out while others do not -- it's a bad mix"
Just ask JP.