Hi Janice,
As of this time, the app doesn't show how far you ran. Most of us download another app that tracks your mileage. Like Runkeeper, Mapmyfitness, a GPS app, etc.,,, open your music app first, start your music, then your other app to track your mileage, I turn the volume off on that one , then open the c25k app and then it should all work for you. Hope that helps. Good luck.