Over on Flowing Data, Nathan Yau mapped out Where people run in major cities across the US. I thought I'd do the same with the four major cities in Tennessee. I used RunKeeper's route search tool to find routes in Nashville, Chattanooga, Knoxville, and Memphis and then graphed them altogether on tile maps from CloudMade. See anything interesting.
As Yau pointed out in his post, most people like to run near water or in state parks. I think this is true here in Tennessee as well, but also note that many run where they work or live or go to school.(Click on the images below to see them full-screen)