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Reason 5: RunKeeper on the Pebble
I use various devices to track my runs and one of the original apps that was advertised on Kickstarter was Runkeeper. With the Pebble and Runkeeper you can view your exercise progress that is running on your connected smartphone right on your wrist.
In addition to viewing my basic running stats, I am also able to control the music playing on my smartphone with my Pebble.