Dmg standing still vs Dmg while moving

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I'm not a baseball player but I have broken many a stick in my days. You know what was the easier way to break a stick? To run up to something hard and put all that kinetic energy into my hit. And from what I've seen of baseball hits, you don't hit a ball from "standing still", you move your whole body in quite a specific manner in order to maximize your energy output. I think that's what others meant when saying "moving gives your attacks more power".