indeed. make sure all strength training is impact and weight free. no-one under 16 should be doing any weights as it can damage natural development. that said 10 isnt too young for most training, as antony said make sure his training is impact free, all ground level and fun. please keep us updated and any questions, feel free to PM me.
im 15 :s am i in any trubble lol i dont relly do wights but like pull ups and push ups etc