Don't make him feel like he's let you and your husband down by not playing these sports next year. He should also not be told that the main reason that you want him to play sports is because he needs to stay active because he is overweight. He should play sports because he enjoys the games and the company of his teammates. There are other avenues and activities besides organized sports where he can develop socially and make friends. If your boy is retreating from sports, this may be a signal that he is retreating from much more than these games. You need to find out what is really causing his fears. You and your husband might want to talk with a family therapist if you can't connect with your son regarding what is beneath his fear of getting hurt in these sports.
Boy Afraid He'll Get Hurt in Sports
Toddler and Teenager Expert Advice from Carleton Kendrick, Ed.M., LCSW