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The short answer to the question, what muscles do push ups work is that they work the muscles of your upper torso. This is a simplification however. The muscles of your upper torso include the following: 1  Pectoral muscles (pectoralis major and pectoralis minor)  Deltoid muscles (the muscles in the shoulder)
The major muscle groups used for chin-ups are the latissimus dorsi back muscles and biceps brachii arm muscles, but other back, arm and shoulder muscles assist the lats. Compared to pullups, chin-ups use the pectoral muscles more at the start of the movement and focus the biceps and forearms slightly more.