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Pretty sure it is just physics, your body pushes against the ground and the ground pushes back to equal the force. This is why someone heavier hits like a mack truck. That is speaking to a correctly thrown punch... arm punches are totally different.
Talking about rotation, you have to have your feet planted on the ground first. That is where the power comes. Just turning your hips means that if you were hanging from a rope you could hit just as hard as if your feet were on the ground and that is not so.
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