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Using a modded APK for a tool that handles sensitive login credentials is dangerous.
If you find the official SyncMyTracks too buggy or want a safer experience: SyncMyTracks (Trial version) - Apps on Google Play
: Automatically syncs fitness data between services like Strava, Garmin Connect, Polar Flow, and Nike Run Club.
The official SyncMyTracks app is highly rated for its "set it and forget it" utility when it works.