Oh there's all sorts of things a pro contract will prevent you from doing. I had a friend in the NFL, he was a long snapper, a far cry from being Tom Brady. No pickup basketball, riding motorcycles, skiing/snowboarding, etc.......The better and more in demand you are, the longer the list of activities you cannot participate in no matter the on/off season. All for good reason. Could you imagine the investment made in these top guys only to have an entire season ruined because your starting QB laid his motorcycle over during the off season? Not going to happen. Same thing as a top college athlete riding the bench waiting for the draft. It makes zero sense to take a chance. An athlete's career is already short enough even if they manage to avoid injury.One of the NFL team's just told there QB to stop playing any pickup basketball. The pressure to WIN is real and competitive.
These guys destroy there bodies for pay, it's part of being "competitive" . Lindsey Vonn said her body is shot because of pro skiing, and she is like 40, what a shame.