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