Exercise: Chin-up. Target muscle: Latissimus Dorsi. Synergists: Brachialis, Brachioradialis, Biceps Brachii, Teres Major, Posterior Deltoid, Rhomboids, Levator Scapulae, Middle and Lower Trapezius, Lower Pectoralis Major, Pectoralis Minor, Triceps Brachii (long head only). Mechanics: Compound. Force: Pull.