Full Body Exercise Machine (Instructions Included!) - This versatile upper body fitness machine features significant resistance and a variety of movements and isometric holds to keep your workouts fun and rewarding. Move your grip along the proprietary long handle design for multiple resistance levels, from easiest (wide grip) to hardest (narrow grip).Efficient isometric arm movement and improves shoulder strength, increases stability, injury recovery and prevention, reduces pain and enhances physical function.Sometimes referred to as a torque bar, chest bar or chest spring bar, the Python Power Twister creates uniquely effective resistance by keeping muscles in isometric and isophonic strength and endurance training.