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The prime mover for flexion of the shoulder muscles used are the following: 1  Pectoralis Major Clavicle. 2  Anterior Deltoid. 3  Biceps Brachii Short Head. 4  Coracobrachialis.
Shoulder Muscles. The deltoids are the muscles of your shoulder, which play a crucial role in rotating your arm. Strengthening these muscles will help you put more force in your wind-up, allowing you to throw the ball harder. Among the most effective shoulder-strengthening exercises are the standing military press, seated dumbbell press and upright rows.