Its posture, your stance has everything to do with how you absorb a punch. Some fighters have a better chin than others but generally speaking, you can throw a strike that would absolutely KO me but if Im in the right stance I can absorb it.
Hands up chin down, Jim says he cant watch most MMA events because few fighters in the UFC use their stand up correctly and I agree.
"I fear no man, but Jim Harrison and Mike Stone are the two last men that I would wish to meet in an alley fight. Jim Harrison's fighting style is not flamboyant or spectacular, it's just simple and deadly!" - Bruce Lee sakurabushidokan.homestead.com