I found this app by accident and it is awesome!
its called run keeper.
it tracks you with GPS when you run, tracking time, distance, elevation, and more. Then it logs every exercise and saves them in charts and maps that you can study. See how much you improve see how often and how far you run easy with this app.
I turn it on while listening to pandora and it tells me how far I’ve run and how fast I’m going while I’m running.
find it here: http://runkeeper.com/
There’s an app for that!