My question for the community deals with pronation of the arm. I hear that pronation is natural in the throwing motion and serves to protect the elbow and slow the arm down. I’d like to know when is the proper time to pronate and can you teach it? I’ve seen pitchers on my team that seem to pronate at release. The resulting ball flight is like a screwball. I don’t believe they realize they are throwing a pitch which turns out to have more sidespin than backspin (high speed video shows this even with 4-seam fastball grip). For ultimate fastball velocity and control I would think that one should pronate just after elbow extension and ball release which allows force to be applied directly behind the ball and toward home plate.