### Overview of Heart Rate Zones Plus App - **Purpose**: The app is designed for users to track the time spent in different heart rate zones over specified periods without manual checks after workouts. - **Functionality**: It allows users to see their time in heart rate zones daily, weekly, monthly, or over 30 days, with detailed breakdowns and goal setting. - **Key Features**: - Customizable time periods for tracking. - Workout-to-zone attribution, showing which sports contribute most to each zone. - Multiple methods for zone calculation. - Personalizable time goals for each zone. - Comprehensive workout breakdowns. - **Privacy**: Users' data remains on their devices, with no tracking or data transfer. - **Pricing**: The app is free to download. ### User Feedback and Possible Improvements - Users have expressed a need for customizable targets that align with individual heart rate zones, rather than relying on general estimators provided by Apple. - Suggestions include incorporating important metrics such as LT1 and LT2 thresholds and VO2 max, ideally within an integrated exercise tracking feature.