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Why does the rotator cuff get injured? . To raise your arm, the deltoid muscle needs to engage. It's well-suited for this task, but as it works, it rolls the head of the humerus upward. . In a healthy shoulder, this upward roll is balanced by muscles that insert near the head of the humerus from below, such as the subscapularis and teres minor. . However, if these muscles don't engage properly, the humerus head will roll upward, reducing the space available for the supraspinatus tendon to slide

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These exercises will work 3 of your 4 rotator cuff muscles. Need more shoulder help? Comment “Shoulder” and we will send you a 5-day shoulder series to help you overcome your shoulder pain and improve mobility. The first exercise emphasizes external rotation of the shoulder and will target the Infraspinatus and Teres Minor muscles. The teres minor is not painted, but lies directly inferior to the infraspinatus. The second exercise emphasizes internal rotation of the shoulder and will work the su