It hasn’t been said (or if it has been it’s been buried underneath a litany of other geeky details), but the M7 coprocessor in the iPhone 5s records your movement data whether you’re using apps or not. Without apps, the M7 keeps a basic log of data, determining whether your phone is in motion and how to decide if it’s an appropriate time to ping for network data. With apps such as Pedometer++, free on the App Store, it’ll pull off current data and a small history of what the M7 has already recorded. The best part about this is when you go to switch apps or use a different one, there will already be a solid baseline of data for apps to draw upon.