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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.
The exercise targets the pectoralis major muscles and, more specifically, the muscles' sternal heads. People commonly refer to the pectorals as pecs or chest muscles, and the sternal heads make up the bulk of your chest.xecution of a push-up also requires the short head of your biceps brachii and erector spinae muscles. These muscles are found in the front of your upper arm and along your spine, respectively. During a push-up, your biceps are a dynamic stabilizer, while your erector spinae is an antagonist stabilizer.