The M7 Motion Coprocessor in the iPhone 5s, opened up new doors for exercise apps. It's a great innovation in the space, but what about folks using any other iPhone? While they might not have access to the M7 there's still some great exercise apps out there, like this one from Puma.
It's called Pumatrac, and simply put it's a run tracking app. It's free to download, and has a couple of great features to improve your workout experience.