Core Push Up With Dvd. Multi-Position Central Push Balancing Board; Exercise Specific Muscles: Shoulders, Back, Chest And Triceps. Comfortable Interchangeable Anti-Slip Handles And Removable Balance Block For Use As A Multi-Position Lifting Table; Portable And Lightweight - Instability Resistance Is Great For Increasing Difficulty To Work On A Wider Range Of Muscles. It Can Be Removed For Flat Workouts. Easy Assembly.