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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.
Muscles Recruited in Pushups. Categorically, pushups are considered a chest exercise. But in addition to the large pectoralis major muscle that defines the chest, pushups also recruit the triceps at the back of the upper arm, and the anterior deltoid at the front of the shoulder.