Guaranteed money is what makes me like college sports more than pro sports. Aaron Rodger would have taken care of his body much, much more if he wasn't under a guaranteed contract.
The whole idea of players not playing in preseason games and that they're going to play themselves into shape is a big reason why there are so many injuries.
Then... There is Tom Brady who took off no more than two weeks whether he won the Super Bowl or not. Good for him, even though he was def part of deflate gate.
I have similar thoughts about Kevin Durante, Kobe, Jordan, Pippen and a few others.