The 4 muscles and tendons of the rotator cuff are called the supraspinatus, subscapularis, teres major, and infraspinatus. These tendons and muscles work together to stabilize the glenohumeral joint and move the humerus in the shoulder socket.
GLUTE KICKBACK - The exercise is fit for the toning up of the glutes, involving the hamstring. The exercise works more on the area under the glutes where the hamstring starts (creating the split between the glutes and the hamstring).
DUMBBELL FLYES ON STABILITY BALL - The dumbbell flyes exercise, performed both on a flat bench and on a stability ball, focuses on the whole chest, but in particular on the external part. This exercise involves the anterior deltoid as a secondary muscle.