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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 exercise for pitchers. Push-ups are the best total upper body strength exercise for building chest and core strength all at once. Be sure to do the following: 1  Have the hands shoulder-level and just wider than shoulder-width.  Contract the glute muscles to help keep the body level and help core contraction.