Cardio. It can be your greatest weapon against the zombie hordes, as we know. But a marathon? That's gonna push the Survivors to the limit. But you gotta do what you gotta do. You can download the Saint Sylvester Marathon scenario for Zombicide now.
From the post:
“Ma”, Ned’s mother, used to watch the Brazilian Saint Sylvester Marathon. I guess she even took part once or twice. She taught her son a trick or two. Let’s outrun these runners and get our isotonic drinks!