Zombies!

lesspaul

Several people have posted in the "Strange reasons" thread that they want to get fit in order to survive the Zombie apocalypse.

To that end:

Zombie infested 5k runs: http://www.runforyourlives.com/

And an app for your smartphone to motivate you to run (including Zombie themed story and background) https://www.zombiesrungame.com/

babyshme

Not every one lives in those areas. Do a local search. Here is a local on for MI. http://thezombiedash.com/