brandonp2412/flexify — reverse-engineered prompt

Build me a polished gym progress tracker called Flexify. I want it to feel fast, simple, and made for people who just want to log workouts without creating an account or needing internet.

The app should let me record strength workouts with exercises, sets, reps, and weights, and also track cardio sessions by type. I want a clear history so I can see what I did last time, plus simple graphs that show my progress over time. Add rest timers with an alarm so I know when to start the next set.

Please make it work fully offline with everything saved on the device. Include a settings area where I can turn features on or off and switch between light and dark themes. The design should feel modern, gym focused, and easy to use on mobile, with support for larger screens if the project already allows it.

Use the existing Flutter project setup and look up current docs online if you need to.