The hand synchronization pitching drill is designed to help pitchers develop a rhythm for the beginning of the pitching motion. To complete the drill, have them start with their hands together and practice bringing the glove elbow up while the pitching arm assumes the cocked position.
The arms should move together in a fluid motion. If one hand moves before the other, it will cause the rhythm of the pitch to be off as well as throw the body’s balance off. Once pitchers can synchronize their hands, you can have them add in the step back and the kick, to help pull the move together.