ANATOMY

Detailed explanation-1: -Agonist is deltoid, antagonist is the latissimus dorsi. As the muscles contract across the shoulder joint it brings your shoulder upward into flexion as you push the ball the opposite happens and the antagonist becomes your deltoid and the latissimus dorsi becomes your agonist.

Detailed explanation-2: -The muscles that perform these movements, and therefore are antagonists of the latissimus dorsi, include the deltoid, supraspinatus, biceps brachii, coracobrachialis, pectoralis major, infraspinatus, and teres minor.

Detailed explanation-3: -Synergist: Pectoralis major and minor, Subclavius, Serratus anterior, Trapezius, Rhomboid major and minor, Levator scapulae. Antagonist: Deltoid, Supraspinatus, Infraspinatus, Teres major and minor, Subscapularis.

Detailed explanation-4: -Latissimus dorsi works collaboratively with the teres major and pectoralis major to perform actions of the upper extremity. Together, these muscles will work to adduct, medially rotate, and extend the arm at the glenohumeral joint.