The Push/Pull/Legs Split is one of the most common and effective bodybuilding split used to pair muscle groups while gaining size and strength. Push days will consist of using your chest, triceps, and shoulders or workouts that involve pushing movements. Leg day is obviously all of the muscles in your legs and calves to help strengthen core and power in lower body. The pull day will in involve your back muscles and biceps or workouts that incorporate a pulling movement.