The two balls you play in your hand are called Baoding Iron Ball, also called Fitness Ball, which has a long history and is the first of the "Three Treasures of Baoding". Baoding iron balls are made of stone, steel and copper, and some only use two walnuts as balls. When playing with the ball, the fingers exercise moderately, which has a regulating effect on the body meridians. We should be patient, confident and persistent in playing fitness ball, and try to alternate with traditional fitness programs such as walking, practicing Qigong and playing Tai Ji Chuan to enhance the fitness effect.