Shoulder Rotation

The shoulder rotation creates noticeable work through the shoulder and shoulder blade. The armbar involves twisting the weighted arm through internal and external shoulder rotation. Rib expansion restrictions are linked to shoulder rotation limitations and can guide manual force application. Restricted anterior thorax expansion can force the humerus into internal rotation compensation and create an internal rotation limitation. Restricted posterior thorax expansion can contribute to scapular retraction, excessive external rotation mechanics, and external rotation limitation. Checking shoulder internal and external rotation is presented as a fast screen for rib cage zones needing manual facilitation.