... tennis, squash, cricket, badminton, baseball, bowling, basket-ball,, motocross, mountain climbing.2. Increases strength in fingers, ... time, Advantage: 1) It is a small ball, which can make people achieve sporting effects in ... :1) The balance of the rotor has been corrected by computer, so the ball has very excellent ... on the surface of the ball. That can prevent the ball from sliding down to the ground ...