ppko said:
this satement is not true and I believe my students would go with me on this one, while most people believe this statement it is not true at least to what I have found, I can hit a lot harder with being loose than being hard, ask Xequat he will definately attest
Nope, everything ppko wrote is wrong. Just kidding; I'm going to pay for that in class. But I do agree that loose is almost always, if not always better. I can't think of any situations where tight would be better, but I'm sure that there are some. Like rutherford stated, tight muscles will create resistance, therefore slowing your movements down. My video didn't have sound, but it looked like some sort of sticky hands drill, and every time I tense up during those drills, it sends a message to my opponent about what I'm going to do since we are in contact, as well as slowing me down, so there's a double whammy. But keeping loose allows the muscles to reamin free and create speed, which in turn results in power. I still tend to tense up my fists on contact with punches from time to time, but you really shouldn't have to if body mechanics are good. But, with open-handed attacks like those in the videos, definitely stay loose to lower friction and resistance.
Ever hit a baseball or golf ball really far when you weren't really trying and thought "wow, that went pretty far; if only I had really tried harder, I'd have gotten all of it and it would have gone even farther?" Fact is, it wouldn't have gone farther. You were loose, which allowed your muscles to move unrestricted. Same concept.
Keep in mind that he might go slower in a real fight because in the video he wasn't following through with his attacks since the other guy was an uke, not an opponent or enemy. Try it in class...grab some pads and punch with all your might and tense muscles then punch loosely and see which hurts more. Same with open hands. One drill we've done is to stand to the side with the uke holding pads in front. Slap as hard as you can with tight muscles. Then slap really loosely Follow through on both, like you are trying to slap the uke's back or even the wall behind him/her as you stand perpendicular to him/her. It feels to me like the harder attack is a surface blow and yeah, it could hurt. A lot. But the loose one feels like it just goes through me. It sucks. Even more.