Originally Posted by Prince Mongo
Wrong, a tightly clenched fist tightens up the muscles in the forearm that inhibits speed. For the first part of the punch you want a degree of relaxation in the fist to have relaxed muscles in the forearm for maximum speed just as you would have a degree of relaxation in those muscles if throwing a ball at high speed. You can clench the fist more at impact but for max speed you don't want that before.
Exactly. Well said.
There are about 10 posts a week about punching power, and 98% of all the responses, while well-meaning, are totally wrong.
If it was just force = mass x acceleration, we wouldn't have different levels of punchers in the same weight class. They all have good technique - they're professional fighters. There are intangibles and little eccentric elements to being a puncher that don't work from a purely scientific standpoint.