So unique and comprehensive is the Lifeline Gym that college, olympic, and professional sports teams and superstars of every sport use the Lifeline Gym as an integral part of their fitness program. For increasing strength or shaping figures, Lifeline is the best portable professional gym. In addition, it converts into a unique treadmill, pulley system, and variable resistance machine. Lifeline is a 2-pound gym that can tone and shape all the muscle groups in your body. The secret is the lifeline resistance cable, which has dynamic variable resistance that instantly adjusts from three to 350 pounds of resistance (illustrated exercise booklet tells you how to move from one exercise to another instantly). Features: It's portable, space and time efficient, provides natural variable resistance, sports specific, cuts subcutaneous fat more efficiently than free weights. Available in men's or women's models.