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More Velocity!
acceleration X mass = force... since the mass of your arm and body remains constant, the speed must increase for change.
I guarantee if you relax you will be faster. Completely relax the arm and shoulder, and dont tense at all until impact.
It works because you're learning to fully relax the antagonistic(opposing) muscles of the punch. And the tension at the end adds more SNAP as well as bracing the arm for a solid impact.
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