The Pitcher Assist, uses patent-pending resistance technology to build muscle and strengthen shoulders, rotator cuff, forearms, and wrists. It helps pitchers practice grips and strengthen core muscles for breaking balls. Not just for pitchers, it enhances muscle strength for powerful long-distance throws. Simply unbuckle the Bat Strap from The Hit Assist, attach The Pitcher Assist, and start training. First-time users should use the Blue Tube only. See below for more details.