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BETTER RESULTS - Provides a full range of motion you can't get from standard sit-ups All-in-one Adjustable Weight Bench is designed for full body workouts to shape your arm, abs, back, chest, glutes, hamstrings. Arch design naturally curves to the back for more effective core work that protects your lower back constant tension, and a full range of motion which regular crunches do not provide to help you get that six-pack ab and a flat stomach. isolates the abs for optimal workout results