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a little about me...a former minor league pitcher and current 12U travel team coach...the rubber itself has nothing to do with helping get velocity. I can throw the same speed with or without an actual rubber. As long as I can keep my pivot foot from slipping I will be fine. Loading your weight on to your back leg and pushing forward with that back leg gets you going forward. Your pivot foot then rotates as your hips rotate and drags on the ground towards home plate just before releasing the ball.