Generally, the ball rotated by the old people in the park is called fitness ball. Fitness ball is an interesting recreational equipment sport. Fitness ball evolved from hickory, and the ancients put hickory in their hands to keep fit. At present, there are hollow iron balls, stone balls and jade balls, all of which have different models. When exercising, hold two fitness balls and rotate rhythmically clockwise or counterclockwise. You can practice for more than 10 minutes at a time and several times a day. Fitness ball is mainly to enhance the toughness, flexibility and coordination of fingers and wrist joints, which can enhance the strength of fingers, palms and wrist joints, and is quite beneficial to prevent hand shake and wrist joint stiffness in the elderly. Stimulating palm acupoints with fitness balls can reflect the function of central nervous system, strengthen brain and improve intelligence, and eliminate fatigue. At the same time, it also has the effects of relaxing meridians, promoting blood circulation, strengthening tendons and bones, and strengthening internal organs. Therefore, it is beneficial for the elderly to stick to fitness ball exercise.