1) I'm kinda iffy on whether or not it's right that they're training the kid like that, but Mozart was forced to play and ended up loving music, so... I dunno. 2) Kid's gonna be an absolute beast of a wrestler when he grows up. I think I read about this somewhere. His body doesn't create certain proteins or something that ends up making him jacked?
I didn't find it too surprisingly (though the abnormal amount of muscles is sort of freaky), since most if not all kids who later become professional gymnasts in events like Olympics starts intense training at that age, if not earlier.