This document contains class diagrams for a gymnasium management app, including classes for the Gymnasium, Coach, Member, and Session. The Gymnasium class contains attributes like id, name, and address. The Coach class contains attributes like id, name, last name, age, and specialty. The Member class contains attributes like id, name, last name, address, date of birth, and gender. Sessions are led by Coaches and can include multiple Members, while Members register at Gymnasiums and may attend multiple Sessions led by one or two Coaches.