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If you like to run, the Nike+ app is the best one I`ve found. You don`t need to wear nikes or have a pod sensor in your shoe anymore to be able to sync with this app. It runs via GPS. You can map your runs, track your progress and automatically push for your pre-set motivation song. I love the fact that this app will auto sync with your online Nike+ account if you choose to do that. That means your runs are always stored in a safe place online instead of only on your phone. I have tested the mileage on this app versus other methods of distance measuring and it is very accurate in determining the distance you have run/walked. This is an app I highly recommend if you are a runner or just want to keep track of your distance traveled.
Image Source: http://itunes.apple.com/au/app/nike+-gps/id387771637?mt=8