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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.
5. Cancel. Push-ups work muscles in the arms, chest and shoulders, including the triceps muscle. Learn about improving overall upper body strength with push-ups with help from a strength and conditioning specialist in this free video on exercise and fitness tips.Part of the Video Series: Exercise & Fitness Tips.ush-ups work muscles in the arms, chest and shoulders, including the triceps muscle.