The essay focuses on creating a data model using a spreadsheet to help a local leisure center promote fitness by tracking Body Mass Index (BMI) changes. The model allows users to input personal information, track diet and physical activities, and monitor their progress over 10 weeks. It features user-friendly tools like dropdown menus, automated calculations, and pivot tables to simplify the process for users unfamiliar with spreadsheets. Feedback led to improvements such as adding color, button...