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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.
The bench press works upper body muscles including the pectorals, triceps and biceps. How to: As with the dumbbell press you do a bench press with your feet flat on the floor and your back on the bench. With your arms shoulder length apart, use an overhand grip to take firm hold of the bar.