OYO Personal Gym: Total body portable gym that provides the same benefits as strength training with weights, without weight. Powered by patented SpiraFlex resistance technology used to keep NASA astronauts in shape on the International Space Station for 10 years. Also features DoubleFlex activation on opposite sides of muscle groups with each movement, building a balanced body in less time. Combining strength with movement, without weight or momentum, the OYO Gym is the breakthrough fitness technology to sculpt and tone your body in less time.