I heard some argument that when you punch someone's body, the intent to punch through his/her body is not a correct idea, since some of the force will be turning into 'push' force which causes no damage. Momentum = Force / Time, so the shorter time your fist contacts the body, the greater momentum and damage you will cause. The argument suggests punching to only 1 inch or 2 inside the body. The argument doesn't really make sense to me however. If your punching speed is fast enough, at the point when you punch through the body, the body is still not moving, and of course no 'push' will happen. But it is only my theory. What's your opinion on this? What's the best way to achieve maximum damage?