I'm pretty sure ds1 is too young for anything structured, but he's very active and boisterous and loves being very physical when playing with other children. If they are a bit older it's usually ok but often kids his age especially girls don't enjoy playing so rough. Sadly he hasn't realised yet that when they shout and run away it's not a cue for him to carry on and now he's started biting out of excitement too (he will grab them from behind and bite their backs). The biting is obviously something I am trying to deal with (encouraging kissing instead etc, taking him away from situation when he does it) but I just wondered whether a structured activity may teach him some boundaries when it comes to physical play.
Does anyone have experience with any martial arts that are hands on such as judo? What age would he be able to start something like that?