Membership system. Fitness clubs originated in Europe and America. Today, in western developed countries such as Europe and America, fitness is no longer the pursuit of fashion. More importantly, it has gradually become a part of people's lives and a necessity. Membership is used in health clubs, which can keep customers' loyalty. In order to retain members, a health club must first satisfy its members, retain valuable members and cultivate loyal members. The essence is to keep the fitness effect and satisfy customers.