From the FAQ:
Am I allowed to throw up?
Okay, we can’t technically stop you from throwing up, and quite frankly, that’s just part of the race, but don’t MAKE yourself throw up. The real challenge is to keep all 12 down, so don’t cheat yourself.
If I had known about it before yesterday I might have signed up, just to eat free donuts. Of course, there would have not been any running. Maybe some ambling, but definitely no running. The only time I might run is if zombies were chasing me and even then I might just lay down and tell them to eat my brain already.