Thinking about training for a marathon? Why not begin your training with something a little unusual? Run For Your Lives is part 5K race, part obstacle course, part capture the flag and part brain-sucking zombie infestation. To survive this post-apocalyptic adventure – held monthly in cities across the U.S. – you will need to crawl through mud, overcome a dozen man-made obstacles and dodge bloodthirsty zombies all the way to the finish line. Tapping into the growing popularity of Spartan Races and Tough Mudder endurance runs, Run for Your Lives combines sport with schlocky horror, athletics with the living dead. Being chased by zombies hungry for human flesh does tend to motivate a person.