Throwing a Football | Page 2 | General | TopVelocity Baseball Forum

It is proven here that high velocity pitchers are internally rotated and pronated earlier than low velocity pitchers. Pronation and internal rotation with these high velocity pitchers is happening at release because before release the arm is fully externally rotated and more supinated. Where this is confusing is that at the point of release the palm of the hand is facing the target with fingers behind the ball or a more neutral position which will create the 12, 6 rotation. After release the arm immediately goes into full internal rotation and pronation which supports deceleration and is critical for arm health. Checkout the clip of Chapman releasing the pitch you can see he is pronating and internally rotating into his release point. It is a little jumpy because I took the frames from different pitches of his to create each frame. His finger position is also moving a little bit because he was throwing different pitches here but you can see his wrist pronating and the arm internally rotating.