This Kegel ball also call ben wa ball, it has divided into three training phases.
1. Adaptation phase: In the first phase, choose a 45g ball and stick to it for 15 minutes a day for two weeks.
2. Advanced stage: When the body has adapted to the alertness of the Kegel ball, choose a 95g ball for exercise.
3. Vibrating ball: When the body can easily control the shrinking ball in the body, choose the vibrating ball with 9-frequency vibration for exercise.