: Defines different tiers (e.g., "Basic," "Premium," "VIP") and their monthly costs.

): Many Members can sign up for many Classes . In the diagram, this is usually resolved by a "link table" called Class_Bookings .

: You can go to Database > Forward Engineer to automatically turn this visual diagram into actual SQL code that builds the database on a server.

: This tracks which members are signed up for which specific class sessions. 3. Operations & Revenue

: Records transactions, linking a Member ID to an amount, a date, and a payment method (Credit Card, Cash).

If you were to open gym-diagram.mwb , you would typically find the following core "Entities" (Tables): 1. The Member Core