【Strength Training】: Push the core in the direction of the arrow, automatically started by the internal spring. The force of each rotation is stronger than the rotation, exercising the strength and muscles of the arms., 【Good for Health】: Exercise fingers, wrists, hands, forearms, enhance arm strength, and help reduce inflammation caused by arthritis, carpal tunnel syndrome, or tendonitis. Very suitable for fitness people, athletes, guitarists, pianists and white-collar workers., 【Auto Start】: You only need to push your core in the direction of the arrow, it is started by the internal spring, no ropes required, small and lightweight, easy to carry, you can exercise anytime and anywhere. This new type of wrist ball is self-activating and does not require a pull cord., 【HIGH QUALITY】: The ball has a built-in alloy spring that uses the inertia of the spring to rotate the center of the ball. The device spins smoothly and noiselessly. The ball shell is made of special plastic material and is very durable., 【Easy to use】: Mechanical design, no power supply required. The compact design can be taken anywhere, whether in the office, gym or at home, and can be used at any time to exercise arm muscles or as a stress-relieving toy.
