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Sit on the edge of a box or bench and place your hands on either side of your hips with your fingers facing forward. Your feet should be flat on the floor with your knees bent 90 degrees. Extend your elbows to lift your glutes off the box and shift your body forward slightly. Keep your shoulders back and your chest lifted as you bend your elbows and lower your body straight toward the floor. Extend your arms forcefully to return to the start.