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How does Dynaflex Powerball work?

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The outer shell of the ball encases the rotor, and when that rotor spins, it provides torque that causes the ball to rotate and jerk. Depending on the brand of powerball, it has the potential of spinning of 9,000 to 18,000 rotations per minute, which in turn provides about 25 to 40 pounds of torque.
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