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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.
However it's not so strange when you think about it. The bench press is a core fundamental exercise for developing upper body strength. You're not only working your pectorals (chest), you are also working your anterior deltoids (front shoulders), triceps brachii, and latissimus dorsi (back).