Sync of different sport portals

play.google.com - SyncMyTracks offers a service to synch different sport portals. Simply add the accounts you want to sync, and SyncMyTracks will do the synchronization. In the free version, account sync is unavailable. Only you can export and import your activities. In addition, in the free version you can only export the last 40 activities at most. The paid version contains no ads.

RunGap does the same but it is only available for IOS.