The following is a brief introduction (from Wikipedia)

Chi machine is a passive aerobic exercise equipment, which was developed and first manufactured in Japan by Keiichi Ohashi, president and engineer of Skylite Industry company, in 1988. In 20081February 18 1990, the Japanese Patent Office granted the patent of Intelligent Machine. The aircraft was originally named Sun Harmony, and later changed to Sun Ankang.

In 1927, Nishi successfully built "Nishi Health Care System", which is a series of six exercises, one of which (kingyund) is the basis of modern pneumatic machine movement. This kind of special physical exercise is adopted in Qiudao martial arts, which is called "goldfish exercise".

The original concept of Sun Ancon Chi machinery and equipment comes from Japanese scientist Zuo Shi Inoue, who is the president of Japan Oxygen Health Association. He has studied the effects of human oxygenation for 38 years, and thinks that hypoxia in the body is the main cause of diseases.

PS. This thing is rare in China. If you want to lose weight, you'd better run. . .