Define the gym's operating model first
The U.S. Census Bureau describes NAICS 713940, Fitness and Recreational Sports Centers, as establishments primarily engaged in operating fitness and recreational sports facilities featuring exercise or other active physical conditioning. The category includes examples such as fitness centers, gyms, and health clubs. That industry scope supports a dedicated national guide while leaving room for meaningful differences among independent gyms, multi-purpose facilities, studios, and other fitness operations.
Start with a practical inventory of what the gym sells and where each sale begins. Document membership enrollment, single visits, class registration, training sessions, merchandise, refreshments, and other services that actually apply. For each item, identify the system that creates the member or order record, the staff role responsible for it, how the customer confirms the purchase, and how the completed payment is matched back to the correct record.