acelete auto-start 2.0 power ball wrist trainer ball forearm exerciser wrist strengthener workout toy spinner gyro ball with led lights acelete ■use our self-starting wrist ball, as the speed of the gyro increases, the centrifugal force also increases, and the<br> reaction force on the wrist increases,we can enjoy muscle training freely in anytime, anywhere. <br><br>■how to start your new wrist ball. <br><br>actually, starting this gyro ball is very simple. you only need to make some practice and then you can master<br> this skills. now, we recommend you proceed as follows: <br><br>step1: take the gyro ball in your hands with the rotating core facing up and then use both of you thumbs to<br> turn the rotator again and again ,up to the corresponding elastic core position along with the arrow direction. <br><br>step2: hold the wrist ball tightly and then release yours thumbs off the rotator immediately, the rotator will<br> be running at the speed of 1500 to 3000 rpm. at the same time ,turn your palm down slowly rotating your wrist<br> to get the power to maintain the existing gyro ball or higher than the starting speed. <br><br>step3: when you turn the core speed up gradually , you will feel the same synchronous growing reacting power<br> on your wrist and your arm with the rotating gyroscope. <br>when you reduce the circle diameter your wrist draw , the speed will be up. the smaller the circle diameter, the faster <br>the rotation of the core will be meanwhile ,the more difficult the wrist will feel to move. <br><br>■application range of gyro ball: <br><br> muscle training from wrist to elbow: fingers, wrists, forearms, upper arms, biceps, triceps and shoulders, improve<br> arm strength and flexibility, prevent tendonitis. <br><br> suitable for the elderly, nursing, treatment, rehabilitation personnel: in fact, gyro ball does not put too much load<br> on the muscles, improves blood circulation in the fingers and prevents nerve damage. <br><br> eliminate work stress, gyro ball's led flash and vibration make white-collar workers relax.