Send him out to sports like soccer or judo. Nothing else, because a kid should not get advanced fighting sports like box and others, whilst other sports are useless for your kid.
Send him to judo, I mean it. If you send him out there now, he'll have a good time with the kids, he will learn how to defend himself, and he will have a different mentality. Soccer will put your kid in a slim, but good condition, which he'll be greatful for later. Don't let him play those shitty games like that.