My philosophy is: If you can’t have fun, there’s no sense in doing it.
~Paul Walker (Brainy Quotes)
Reading a comment thread in the Fit Fatties Facebook group, I found a mention of Run An Empire. It’s a running game app (app game? story app? “strategy running game”), similar to Zombies, Run!. The difference being, from what I can see — it’s still in closed beta, instead of earning items to build up your virtual zombie compound, you actually capture & defend the real world space you run through.