This video is from an older version of Muscle Premium. The prime movers of elbow flexion are the biceps brachii, brachialis, and brachioradialis. The prime movers of shoulder flexion are the deltoid (anterior head), pectoralis major, biceps brachii, coracobrachialis, and serratus anterior. The prime movers of forearm supination are the supinator and biceps brachii.

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