We take your privacy seriously. This Privacy Policy explains how we collect, use, and protect your personal information.

1. Information Collection

We read the following health data via Apple HealthKit:

• Resting Heart Rate: for calculating personal heart rate zones and training load
• Heart Rate Variability (HRV): for assessing recovery status and training readiness
• Sleep Data: for analyzing recovery quality and fatigue levels
• Heart Rate: for real-time heart rate analysis during workouts
• Active Energy: for calculating calorie burn and training effect
• Body Fat Percentage, VO₂ Max, etc.: for comprehensive health assessment

The above data is only read after your explicit authorization, and all data is stored solely on your local device and iCloud account.

2. Data Usage

• All health data analysis is performed on-device and is not uploaded to any server
• We do not share your health data with third parties
• Heart rate zone calculations and exercise recommendations are based on local algorithms

3. Data Security

• All data is stored within the iOS system security sandbox
• iOS system-level encryption protects user data
• No account registration required — no personal identity information is collected

4. User Rights

• You can revoke authorization at any time in the Health app
• You can manage individual health data permissions in this app's settings
• Uninstalling the app will delete all locally stored data

If you have any privacy-related questions, please contact us through the in-app "Settings → Contact Us" channel.