Hi there! I see that your F Fit app keeps crashing. Let's get this sorted out. To help you best, could you tell me a bit more about when it crashes? For example, does it happen when you open the app, during a specific action, or randomly?

In the meantime, here are some initial steps you can try on your AndroidOS 10 device:

1. Clear the App Cache and Data
- Go to your device’s Settings > Apps > F Fit.
- Tap on Storage.
- First, tap "Clear Cache" to remove temporary files.
- If the problem continues, tap "Clear Data" (note this may erase preferences and require you to log back in).

2. Restart Your Device
- Power off your phone completely and turn it back on. This can refresh the system and fix temporary glitches.

3. Check for App Updates
- Open the Google Play Store, search for F Fit, and see if there’s an update available. Developers often release fixes for crashes.

4. Reinstall the App
- If the crash keeps happening, uninstall the app, then reinstall it fresh from the Play Store. Sometimes corrupted files cause issues.

If you’ve already done these or the problem persists, we can dig deeper into settings or check for compatibility issues with Android 10.

Are you comfortable trying these steps, or do you want me to guide you through any of them?