Self-Start Gyroscope Exercise Ball Dual Gyroscope Wrist Arm Muscle

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.

【Self-starting design】The movement in the ball comes with a spring starting device, no power supply and no rope. Gently press the inner ball with both

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