Workout tracker app that syncs with other tracker apps

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I think the main selling point of this is that it pulls in data from the popular workout apps, including "Garmin, Endomondo, RunKeeper, Strava, Runtastic, Polar, Suunto, Adidas, Magellan, Nike+ and many others on your iPhone or iPad". One app to rule them all.
Interesting idea. I use a number of these different services (Garmin Connect, Strava, Fitbit, dailymile, MapMyRun) with a different group of friends on each. That means either using a sync service, or cross-posting from one to the other. That said, I think pulling in the data from all of them into a single place where only I can view it all together doesn't really solve the problem of having data spread across multiple incompatible walled gardens.