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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.
What Muscles Do Pull-Ups and Chin-Ups Work. 1  During a Pull-Up the muscles that are mainly worked are those of the upper body and the arms. 2  It is one the largest muscles found on your body, on the lateral sides of the back. It is responsible for supplying much of the force needed to execute a Pull-up.