Corn Jr. went 100 plus games last year and 120 or so games this year as a catcher no problem, he could have gone more. His body was beat up, one big bruise but that never stopped him. You just have to want to be there everyday, be able to weather the tough times when you are struggling or cost your team a game. You need to be able to handle the stress of if you don't get it done, someone else will come in and take your place because it's going to happen. You need a love of the game above all else (except God and family of course), and the realization of how tough it is on any relationship and a willingness to put the game above that relationship if necessary. You have to get up everyday looking forward to getting to the field. Good teammates and management go a long way to making it happen. There is no magic formula, your best bet is having him talk to those who have been there to see what they went through. In many ways it's easier than a 50 game college season where classes, homework and social life intrudes.