its the hardest thing to make some one do what they don't want to do, i was the same way and i believe we are all like that. sometimes it will take some tragic (if he can survive it) to get him realize how important it is. what did it for me is i hang out with fit people, and one day i started noticing how fat and unattractive i was, looked like a slob, also looked so much older than my age. so looking at photos one day i thought shit, i look so unhealthy! and that was it for me. another element that motivated me was my son working out and getting in shape. So we started working out together and we still do. its never too late to look and feel great, if he starts today, then two years from now he'll be where he wants to be. good luck.