Most people know that one of the keys to successful baseball pitching is a consistent release point. This is a point that is driven home by coaches all the time. Most people focus on your arm slot, for good reason. Many times inconsistency in your arm slot can be the major cause of poor biomechanics and difficulty repeating your delivery. I see this a lot in young baseball pitchers that are trying to tweak their mechanics and pitchers that may have discomfort in their shoulder or elbow and are trying to take some pressure off the sore area.
However, the act of throwing a baseball is a sequence of kinetic chain events that ultimately lead to your release point. There are several factors with your lower body and core that may be altering your arm slot and leading to an inconsistent release point without you even realizing.
click for full article 5 Mobility Issues Preventing a Consistent Release Point