An intriguing health exercise, these Bao Ding Health Balls with Tai Chi Ying Yang symbols are used to activate the circulatory system and relieve stress and fatigue. Excellent for those who work at a desk or regularly suffer from back, neck and shoulder tension, this simple exercise is also great for meditating. To use the Bao Ding balls: roll two or more in one hand, first in a clockwise and then in a counter-clockwise direction. You can speed up, alternate or advance the motion as you become more experienced in working with them. The advanced will be able rotate them completely without the balls making contact with each other or exercises with three or more balls. Keep this quick and balancing health charm near your desk drawer or where you typically relax after work. The chime inside the hollow ball rings when the inner ball strikes, generating a calming sound.