Nowadays, there is a very popular sport in the park called Taiji Softball. However, when I saw several old people holding special rackets, some one caught the ball and threw it, and some two or more people threw it at each other. During the whole process, the ball seems to stick to the racket, even if the body turns 360 degrees, it will not fall off. When people catch the ball, they draw a graceful arc from time to time, and their movements are soft and silent, much like Tai Ji Chuan. In Tiantan Park, the reporter saw that this special racket looks like a badminton racket, with an elastic rubber film with air holes on the surface, the ball is the same size and weight as tennis, and there is fine sand inside. Ms. Zhao, who is practicing Taiji softball, told the reporter while demonstrating: "When playing, put the ball in the middle of the racket, then throw it up, do various fancy moves such as remake and turn around, and the ball can't land. In fact, it is to use the principle of centrifugal force and play with cleverness. " An old man surnamed Zhao told reporters: "I used to have a backache and it was very difficult to bend over." Later, I insisted on practicing softball every day, and the old problem of backache really disappeared. " Regarding this popular sport, Wang Xiangdong, an associate researcher at the Research Institute of the State Sports General Administration, said that Taiji Softball is a systematic and multi-directional sport, which can make the neck, shoulders, waist and legs get balanced and comprehensive exercise. It changes the way of hitting the ball hard, and keeps the whole body in a good physiological state in the actions of arc, rotation, turning over and turning around. Generally, the shoulder joint is used as the axis to drive the waist to swing and do various arc movements, so it can relieve shoulder joint pain and lumbar muscle strain. In addition, if the practitioner wants to control the process of hitting the ball well, he should concentrate on every movement, coordinate the brain, eyes and limbs, and achieve the unity of heart and ball, which has a good effect on improving the function of the central nervous system and developing multi-directional thinking. After a certain period of exercise, the coordination and reaction ability of practitioners will be improved. Wang Xiangdong said that Taiji softball, as an aerobic exercise, its rhythm can be controlled by itself and the amount of exercise can be adjusted flexibly. Playing hard and soft, smooth, without high-intensity confrontation practice. General practice 10 minutes later, the body is hot and slightly sweaty; /kloc-after 0/5-20 minutes of exercise, there is a lot of perspiration process; After 30 minutes, the practitioner's pulse can reach 10 second for about 20 times, and the blood circulation is accelerated. So it is very suitable for middle-aged and elderly people to practice. In the interview, Zheng Jiaxian, the stationmaster of Taiji Softball Counseling Station in Beijing Tiantan Park, told reporters that softball seems difficult, but as long as you master the basic essentials, you can play a lot of tricks. People who are new to this sport should practice from the most basic left-right swing, that is, hold the racket and swing it left and right with your knees bent. When swinging to one side, the racket face should be perpendicular to the ground, and the ball can't land. When two people throw each other or several people pass each other, first take the initiative to reach the ball along the direction of the incoming ball, so that the ball can quietly blend into the racket from the frame of the racket. Then the feet are supported, and the legs exert force. Through the cooperation of the waist, the ball in the body, arm, racket and racket rotates, and the ball is thrown along the tangent direction of the arc under the inertia of centrifugal force. Zheng Jiaxian said that softball pays attention to "roundness and smoothness, and the combination of people and balls". When practicing, you must use softball and treat the ball as a part of your body, thus mastering the essence of this sport.