1, Tai Chi ball is round and spherical, and consists of two colors of yin and yang fish patterns, which are divided into solid balls and hollow balls. According to the size and diameter of human forearm, it is 26 ~ 30 cm. Hold the ball with two hands or one hand, and realize spiral winding and internal and external training in the form of internal and external movement.

2. Fitness ball is one of the traditional fitness and health care devices in China. There are stone, steel, copper, jade and cloisonne fitness balls. Mainly produced in Baoding area, also known as Wang blacksmith iron ball. The reason why fitness ball is beneficial to physical fitness lies in the moderate movement of fingers and palms when playing, which regulates the meridians of the body.