You get to play the role of a "runner" in training in a zombie-filled post-apocolyptic world.
It's a well-done story to help make fitness more like a fun game. Running from zombies to help save the world can be quite motivating and enjoyable.
https://apps.apple.com/us/app/zombies-run-5k-training/id5665...
https://play.google.com/store/apps/details?id=com.sixtostart...
There is also a regular game that tells a story while you run: