If you are looking for a total body portable gym that is ready when you are, the DoubleFlex is an ideal solution. SpiraFlex resistance technology was developed for NASA and is proven to be as effective as free-weights. Just snap on 5 lb. rated FlexPacks to adjust the smooth quite resistance, which minimizes stress on your joints (due to the absence of momentum of weights). Patented DoubleFlex action activates both sides of muscle groups during each movement, reducing required workout time. Workouts range from 5 to 20 minutes (see DVD).
