Turning back and forth can activate blood vessels in the hand.

According to the meridian theory of Chinese medicine, "ten fingers are connected to one heart". Meridians connect fingers with cranial nerves and internal organs. When the five fingers move the iron ball, the stimulation of the iron ball on the acupoints of the fingers and palms must keep the qi, blood and body fluid unobstructed. It can dredge meridians, regulate qi activity, relax tendons and activate collaterals, promote blood circulation, and prevent and treat hypertension and various chronic diseases. Long-term exercise can also strengthen the brain, increase wisdom, enhance memory, eliminate fatigue, refresh the mind, and prolong life. Fitness ball is a traditional fitness method in China. According to the theory of traditional Chinese medicine, the human body is a whole interconnected by the meridian system from the inside out. Each hand has six meridians connecting the head and chest, and leads to the whole body from here. Moreover, there are many sensitive acupoints on the meridians at the ends of fingers, palms and backs of hands. Stimulating these acupoints can improve and enhance the physiological function of human body, and the fitness ball produces different degrees of rhythmic stimulation to related acupoints and meridians through the activities of hands and balls.