At this time, there isn't a tool to restore a deleted activity yourself. With the Strava mobile app, as long as the activity was successfully saved and synced to Strava previously, our Support Team can manually restore the deleted activity to your account. Unfortunately, if a Strava app recording is discarded before it is saved, then the data cannot be recovered. Contact us directly by submitting a support ticket through either the help site or the mobile app. For compatible devices, consider uploading the original file from your device or re-sync the activity to Strava.