Market supervision and management department. Gym refers to a place for fitness, rehabilitation and exercise activities, with complete equipment, comprehensive fitness and entertainment programs, guidance from professional coaches and a good fitness atmosphere. Gyms belong to individual industrial and commercial households in China, and are supervised and registered by the market supervision and management departments in China. According to Article 4 of the Measures for the Administration of Registration of Individual Industrial and Commercial Households, the market supervision and administration department is the registration administration organ of individual industrial and commercial households.