100% brand new wrist exercise ball!
Ideal for both young and old
Can be used anytime anywhere without time and space limitation
The first choice for exercising and training
How to use:
Wind the strap to the ball and then draw out the strap quickly so as to set the inner rotor in motion and gradually build its speed by subtle rotation of your wrist. The faster you rotate the ball, the stronger the energy generates, and the LED turns on
Suitable for people who loves golf, bowling, baseball, basketball, volleyball, handball, tennis, badminton, table tennis or other sports need to use wrist and people who works with computer