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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.
As the rotator cuff muscles support and stabilize the shoulder joint during movements like overhead presses, it is recommended to strengthen these muscles with scaption to improve performance and reduce injury at the joint.