DoubleFlex Total Body Workout New for 2017: Upgraded DoubleFlex with strengthen components for increased durability and lifecycle, with 2 year warranty. Fitness On The Go: Your own portable gym. Lightweight, compact and easy to transport, allowing you to train at home, the office or on the go. Replaces Weights: DoubleFlex replaces weights with smooth safe SpiraFlex; resistance used by NASA astronauts on International Space Station. Adjustable Resistance: No need to purchase individual sized weights. Snap on FlexPacks for 5, 10 and 15 lbs. of resistance that feels like free-weights; yet unit weighs less than 2 lbs. Sculpts and Tones: Patented DoubleFlex movement sculpts both sides of muscle groups and builds a balanced body in less time. Durability and Long Lasting: Engineered with lightweight / high strength polymers for durability and long life. Cables are nylon coated stainless steel. Full Body Workout: Includes leg and door attachments and exercise DVD with 9 workouts for Arms/Shoulders, Chest/Back, Buns/Thighs, Abs/Core, Yoga and Pilates. Includes Nick Bolton's 50-page guide with fitness workouts and diet and nutrition programs.