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Muscles of the Upper Torso. 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. Muscles of the upper back (latissimus dorsi, rhomboids and trapezius).
Push-Ups. Push-ups are upper body muscular endurance exercises that target your chest and arms specifically. Lie face-down on the floor with your hands slightly wider apart than shoulder-width and your toes hip-width apart. In a controlled motion, push yourself up, tighten your core and straighten your back.