Heart Rate Trainer

Heart Rate Trainer is an Android app for real-time heart-rate monitoring and structured heart-rate-based training. It connects to a Bluetooth Low Energy (BLE) heart rate monitor (e.g., chest strap) and displays live BPM in a beautiful dark UI designed for high readability during workouts.

Core concepts and purpose:
- The app is built for interval training, zone-based pacing, and post-workout analysis.
- User defined heart-rate zones are derived as percentages of Max HR and used throughout the UI for color coding, charts, and summaries.

Key features:

- Live monitor screen: real-time heart rate display with gauge visualization, zone alerts, recording controls and workout integration.

- Bluetooth device scanning and connection: dedicated BLE scanner.

- Workouts: Workout tab with pre-defined workouts and highly customization user-defined workouts including low intensity steady state (LISS), high intensity interval training (HIIT) and Tabata.

- Data recording and management: heart rate samples recorded into local database with customizable retention policy. Ability to export data to CSV for analysis.

- Analysis (Post-workout / sessions analytics): date-based browsing, visualization chart, zone distribution, summary of metrics and long-term trends.

- Settings: max heart rate configuration, alert preferences, data management and devices management.

Target users:
- Athletes and fitness enthusiasts doing zone-based training.

- Runners, cyclists, and HIIT trainees who want structured intervals, real-time zone feedback, and meaningful post-workout analytics.

- Users who want all data stored locally with export/backup options.

Recent changes:
Initial release