Gyroscope Power Wrist Ball. The faster the rotational kinetic energy is stronger, the greater the power, the equivalent of 50 different weight dumbbells, 8000 rpm is about 14 kg of power, the world record is more than 15000 rpm.
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Gyroscope Power Wrist Ball. The faster the rotational kinetic energy is stronger, the greater the power, the equivalent of 50 different weight
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