Okay so slightly tongue in cheek but my lovely 4 yo ds is quite small for his age. He's quite confident but seems to be on the receiving end of rough and tumble with bigger boys at soft play etc I think because he's small. Obviously we teach him about being kind etc but I also want him to be able to stick up for himself. At present if I told him to hit someone back he'd tell me that's not kind mummy, and he's quite right bless him. I'm wondering how best to do this? Would some sort of judo type class fit the bill?