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The push-up requires many muscle groups, but the primary muscle groups are the chest muscles, the pectoralis major and minor. These are the two large chest muscles and mainly the pushing muscle group of the upper body. When pushing and lowering the body during a push up, the pectoralis major is doing most of the work.
Pectoralis Major. These are the two large chest muscles primarily the pushing muscles of the upper body. It makes up most of the upper body. As you raise and lower your body during a push-up, the pectoralis major is doing most of the work to raise and lower your body.Deltoids.he following steps explain how to do a push-up: 1  Lower your body down on to the floor or a carpeted floor with your palms under your shoulders-slightly wider than shoulder width. 2  Keep your feet close together and dig your toes into the floor helping to stabilize the lower part of your body.