Ha! Ha! Ha! It's a funny old community you're a part of there, where the only reason you'd ask someone not to practice "head high round kicks" was because they happen to be wearing boots!
Actually, you have an idea there, my lads have just started karate and are constantly practicing on each other, think I'll make sure that they wear their boots in the house just to stop 'em hammering each other, the weight'll stop them if nothing else