Use the Lifeline Chest Expander to add progressive variable weighted resistance to your upper body strengthening programs. Increase the range of motion and positioning of flies, pulls, curls and presses to strengthen and stretch pectoral, deltoid and arm muscles. A modern take on the classic tool designed for the original "strongmen" and bodybuilders, this upper body strength training device offers continual resistance and the ability to target specific muscles for rehabbing upper body injuries and creating increased flexible and mobility. Incorporate up to 90lbs of peak weighted resistance by adding or removing up to three (3) 16” cables using Lifeline’s patented Progressive Resistance System. Interchange the cables to customize the resistance and progress in weight as you get stronger. Resistance training uses resistance or force to induce muscular contraction, which builds strength and anaerobic endurance. Resistance exercises also help you increase bone density, improve metabolism and decrease your risk of injury. At Lifeline, we provide resistance training equipment that is both innovative and mobile to make your workout routine both effective and convenient. By doing so, our products are easy to use and can provide significant benefits in overall health and well-being by increasing bone, muscle, tendon and ligament strength. Up to 90lb Resistance: Interchange Resistance Cables from 30lbs to 90lbs peak resistance. Add up to 3 Cables to equal 90lbs weighted resistance: 30lb 30lb 30lb = 90lb weighted peak resistance.