⚡️Acceleration & Deceleration: The Unsung Duo of Pitching Mechanics Everyone talks about how fast they can move down the mound… But how well can you control it once you get there? 👀 Acceleration is your engine — driving momentum, energy, and velocity. Deceleration is your brake system — absorbing that energy safely so your arm, legs, and core can reload without breaking down. Pitchers who accelerate hard but can’t decelerate efficiently are the ones who feel it in their shoulder, hip, or back.