Answer:
Client-based relationships.
Step-by-step explanation:
Client-based relationships are the core of any business. The term can be defined as a relationship between the business and clients. In this relationship, business treats their clients in such a manner to earn their trust and build long lasting consumer-supplier relationship. This relationship approach also helps business to retain their clients in a competitive markets.
In the given scenario, the relationship that resulted in satisfied customers who used a service repeatedly is Client-based relationship. It is because the gym has build a trust of their customers over them and their relationship is also long lasting suggestive from their repetitive use of service.
Therefore, the correct answer is client-based relationships.