Hi there! Sorry to hear your C25K app stopped running in the middle of your workout and that your data was lost. To help you better, can you tell me a bit more about what happened? For example, did the app crash, freeze, or close unexpectedly? Also, did you have good internet or GPS signal at the time?

Meanwhile, here are some steps that often help in situations like this:

1. Complete the workout fully if possible: The app only saves your data once a workout is fully completed—meaning you reach the final screen where it shows your stats or social sharing options. If the app stopped before that, your run may not have been recorded.

2. Reopen your workout day’s log: Sometimes, you can manually adjust or add mileage for the day by going back to the workout log and editing it. This way you won't lose all progress. However, this only helps if you had at least some data saved.

3. Clear app cache: Since you’re on Android 10, go to your device Settings > Apps > C25K > Storage and clear the cache. This can resolve glitches causing the app to stop unexpectedly.

4. Keep the app updated: Check the Play Store if there’s an update available for C25K, as bug fixes are rolled out regularly.

5. Avoid multitasking during runs: Ensure no other apps interfere by running C25K solo during your workout session.

If these don’t help or the app stopped unexpectedly often during runs, let me know. We could try more advanced troubleshooting steps or consider reinstalling the app after backing up any saved progress.

Does that make sense? Can you please share any other symptoms you noticed? That way, I can guide you precisely.