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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.
Photo Credit Jupiterimages/Creatas/Getty Images. Push-ups exercise your upper body muscles, including your deltoids, triceps and pectorals. Individually, push-ups don't burn many calories, but they can add a few dozen to your total calories burned when you do them in multiple sets throughout a workout. You may balance on either your toes or knees when doing a push-up, with your palms placed slightly more than shoulder-width apart.