The Double Arm Ab Tightener is a superior exercise to standard sit-ups. This is due to the fact that you aren’t contracting your abdominals at a 45 degree range of motion on your back, which can be dangerous to your lower back. The Double Arm Ab Tightener focuses on your abdominal area. Upper and lower abdominals are worked and stretched giving you a longer leaner appearance. You also will experience the full range of motion, that is designed to stretch your shoulders, chest, upper and lower back muscles, along with all your abdominal muscles. A truly light and sharp physique can be achieved in a very safe and effective manner. Strengthen, tone, shape and chisel your mid-section for a six pack to be proud of. While shaping and strengthening your mid-section you will also be strengthening your lower back while giving your entire torso increased strength and support.