Re: The first video.
It scrunches my face up a bit, but you'd need to see the kid's overall training to see if he's causing himself any harm. The general though is that he would be too young for such things, but the thoughts do change a bit like the tides... Generally, I perfer the old style block training for kids, up till about age 12 I'd have focused on just teaching him to a heath athletic kid, then on to heavier training in moderate jumps.
The real danger there is a physcological, I really hope the dad isn't pushing the kid into sport to make up for his own short comings, and that the boy real does enjoy it.
