The main joint in the shoulder complex is the glenohumeral joint which combines the humerus and the scapula. Unlike most joints in the body, the glenohumeral joint is a 'muscular joint' meaning that it relies primarily on your rotator cuff muscles to support and stabilize the shoulder instead of the joint capsule and ligaments.
The rotator cuff is made up of 4 muscles: the supraspinatus, infraspinatus, teres minor, and subscapularis. These muscles combine and work together to help perform shoulder movements such as throwing a baseball, swimming, or overhead movements while at work or at home.
Shoulder rehab and even the prevention of rotator cuff injuries involve strengthening up these muscles. Watch this video and learn how to strengthen the shoulder complex for shoulder injuries and the prevention of sports related injuries.