Dana Sorensen and Jono Green, co-owners at Symbiotic Training Center isolate several key issues that can plague a pitcher's performance due to improper shoulder movement.
First common issue: Inability to perform clean shoulder flexion. This can be a result of hunched posture, muscle stiffness or lack of mobility, or a prior injury. This shoulder issue will show itself in compensations that can lead to injury in the neck, lower back, shoulder and core. Tissue work and motor control exercises and drills can help improve shoulder flexion.
Second common issue: Inability to control the shoulder blade. The shoulder blade should be pulling the rest of the arm and shoulder joints with it so everything functions symbiotically. To improve shoulder blade movement, an athlete must perform exercises that make proper shoulder movement muscle memory, including band work.