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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 work a number of the muscle groups of your upper torso. The following muscle groups are trained when doing push ups: 1  Pectoral muscles. 2  Triceps (back of the arm).3  Biceps (front of the arm). 4  Front and rear heads of the deltoids.he short answer to the question, what muscles do push ups work is that they work the muscles of your upper torso. This is a simplification however. The muscles of your upper torso include the following: 1  Pectoral muscles (pectoralis major and pectoralis minor).