My best friend's son is 8 yrs old and obese

Is there anyway you can get him into a sport? Like when your out alone try and make it appealing to him maybe say get some muscles and get strong the girls will like that make some new friends kids love a some friends, and I imagine if you do this in a sports store and get him to start picking out his cleats and bat whatever the sport is gear that gives you the green light go to take him home and stay whatever his name is is going to play..... His already got all the stuff and with your permission I'm gonna sign him up, this is gonna be so fun we can go out and watch him play and have a picnic <---- picnic is cruical for wording fats love a picnic. If you think buying him the shit without permission is gonna be bust let him look around at some stuff to get him interesed and take him back with mum so she feels part of it obviously your going to cover the costs so if she objects because money is an object tell her your paying for the gear we can all go shopping together to pick out some stuff that he likes