The main idea is that you have to get active and move around to collect necessary items needed in a post-apocalyptic, zombie infested world. You can fortify your base with collected items when you are finished with your run/walk. If you don't physically move, you can't collect items.
I was psyched on the idea of hearing hordes of zombies following me with the garbled "graggla aaaaah" noises as an inspiration to speed up and "get away." I've only played the game a couple of times, and so far, I only encountered zombies one time. Very briefly.
So the next step is to take a few minutes to figure out the settings to see if I'm "playing" the game correctly. It has the potential to be a fun game and inspiration to exercise.