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