Wirst sports crazy ball Wrist ball with NEON&counter Increase strength of ... a gyroscope. It is powered by rotating the wrist. The speed of rotation can reach over 12 ... tennis, squash, cricket, badminton, baseball, bowling, basket-ball,, motocross, mountain climbing.2. Increases strength in fingers, ... time and in any place while chatting, watching TV, going outing and mountain climbing, and taking ...