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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.
Push-ups are one of the most basic exercises that are beneficial to build a strong core and upper body using only your body and a flat surface. Push-ups are basic strength-building total body exercises that strengthen the upper body and improve the core strength.oracobrachialis. The coracobrachialis runs from the shoulder blade to the upper arms. During a push-up, the coracobrachialis pushes the upper arm against the body, which is essential to perform a push-up. A well-developed coracobrachialis muscle is necessary for building upper body strength.