I have a question or 2 on roundhouses. I've heard 2 arguments from 2 friends of different styles, both with similar claims, but I'm still unsure on which way is best to hold your foot. One says, "kick with the top of your foot," while the other says, "kick with toes flexed (roughly ball of foot)." They both say you'll injure your foot the opposite way. My question is, which is THE best (realisticaly)? I know to do it the way my instructor says, but I'm curious...