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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)
A basic push up is an effective way to strengthen the chest and arm muscles, and can be easily scaled as you get stronger. Simple push ups require no equipment other than your own bodyweight and your arms, and they can be done anywhere where there is a firm surface with enough space for you to stretch out flat in.