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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.
In the case of the shoulder press, many of the muscles of the upper body assist in the execution of the move. The lateral, or top head, of the deltoid muscle and the rotator cuff work in addition to the anterior deltoid to complete the exercise.