Run Time is an app to help with things like running, biking and driving. You can start the app and then it will keep track of your speed, acceleration, distance, compass heading and log it all to the device. You can save the file to Dropbox or email the detailed logs to yourself. The course traveled can be viewed on a map. Download Run Time and you will be able to test your speed, show how fast you can run. When your done email it to a buddy and see if they can top you. If you like running, driving cars, cycling this app is for you. You will be able to see your stats hundredths of a second by hundredths of a second. Great trainer!