they don't break, therefore nothing to be afraid of! they learn really fast too. i coached at a waterski/gym camp one summer and some of the kids on the trampoline can throw maaadd shit. its insane. for us older guys, we seem to gradually improve, but then once we hit the point where we fuck up our back or break a bone or something, its back to square one. plus, little kids still have their baby teeth, so if they smash their faces on a rail, who cares. them shits are comin out anyways.