1. If the gym provides equipment rental, the invoice will also show the specific equipment name and amount.

2, fitness course fees, the gym will provide different forms of fitness courses, and the invoice will also show the specific course name and fees.

3. Membership dues are generally paid on a monthly basis, and the invoice of membership dues will show the specific number of months and amount.

4. Other expenses: The gym provides other services, and the specific service name and expenses will also be displayed on the invoice.