ghulam36460/gym-app ? reverse-engineered prompt

Build me a modern fitness tracker app in Flutter that feels clean, friendly, and easy to use.

I want users to be able to create and manage workouts, pick exercises from a built in exercise library, track sets, reps, weight, duration, and add notes during a session. It should also show progress over time with simple charts and stats, like weekly and monthly workout activity, body metrics such as weight, height, and BMI, plus some kind of achievements or milestones.

Please include a user profile area where someone can set their fitness goals, manage their profile photo, and see their health info. I also want a helpful AI coach screen that can answer workout, nutrition, and motivation questions based on the user’s data, with saved conversation history.

Make the app responsive, support dark and light mode, and use smooth animations and modern Material style. If you need anything unclear, look up the current Flutter docs online and keep the experience polished and practical.