This is the OYO Personal Gym by Oyo Fitness, an entire personal gym that fits in your hands and uses Spiraflex resistance technology. Its smooth linear isotonic resistance is comparable to free-weights but without weight. The OYO Personal Gym, which offers strength and cardio training, weighs 2lbs but produces 25 lbs.
If you want to add 5 or 10lbs. of weight to the OYO Personal Gym, you can just easily snap on Flexpads. Unlike OYO, free-weights have safety issues, such as straining, losing balance, and joint stress from stopping and starting momentum. Resistance bands produce progressive resistance, therefore the muscle is not fully activated until full extension.
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SpiraFlex technology was used as NASA’s first strength training device on the International Space Station. For a 5-6-month period, over 50 NASA crew members used the SpiraFlex Resistance Exercise Device to maintain bone and muscle in zero gravity. A former astronaut said that that he had ‘returned stronger than before he left,’ thanks to the innovative device.