Fitness ball 1963 was born in Switzerland, so it is also called "Swiss ball". At first, it was only used as a rehabilitation medical device to help people with motor nerve damage regain their balance and motor ability. With its function of coordinating and rehabilitating the waist, back, neck, hip and knee, it has gradually spread to become a popular fitness exercise, and spread to the United States, Europe, Australia and other parts of the world, widely popular and enduring.

According to your situation, it is recommended to use a thickened 85CM fitness ball (yoga ball). The size is based on the diameter measured when flat without inflation, and the maximum load is 300 kg.

You can search on Taobao, and the price is between 50 and 80 yuan.