Similar to t-spine mobility, hip IR is absolutely essential to creating a smooth deceleration path. If the hip closes too early upon foot strike, the arm can open up early, causing an early release and cutting the ball. This can be a killer for not only velocity but spin efficiency and vertical break as well. In addition, a poor decel pattern can cause the arm to “slam shut”, creating damaging forces on the shoulder and elbow. Below are several great hip exercises that every pitcher could take advantage of to get some of that IR back.