Create a UML diagram for a gym Membership Management System. Design a system for a gym that allows the owner to keep track of the number of different types of members that are signed up. The system should allow trial memberships, 3-month memberships, and annual memberships. The system should keep track of users and what kind of membership they have. It should also keep track of whether the user has paid in full, or is paying monthly or is overdue in payment. For each user, the system should keep track of what types of activities the user prefers (weights vs. aerobic vs. spin classes vs. kickboxing, etc.)

Inheritance: 1. Membership is sub-classed by the various types of membership. 2. Payment is sub-classed by the method of payment.