Well IVe done all the usual things...numerous sprained ankles, wirsts, concussions but id say the worst two things ive done were tearing my ACL (had to have an op and wasnt allowed to restart any kind of training until 6 months after the op grrrr!) and a horrible layout flyaway on bars when i was 8 where my feet clipped and i landed straight on my arms. I dislocated both elbows and one should and fractured one arm in two places and the other in 4! UNbelievable amount of pain and unbelievably annoying casts and years of physio after lol!