Blood and Guts Run, Centreville

Most obstacle courses are challenging enough without adding the undead to the mix. During the approximately 5K Blood and Guts Run, however, that's exactly what participants get. As they go sprinting through the Virginia woods, they'll have to traverse gore-drenched body bags, spider webs, a bloody slide, a pumpkin-guts pit, and more, while brain-hungry zombies slog after them. These creatures don't just moan and move, though—they take aim at runners with water guns filled with fake blood, creating a crimson-tinged scene reminiscent of classic horror movies or particularly gruesome ketchup fights.

At the end of the course, runners will collect prizes, including custom-made t-shirts, for the most creative costumes in a few categories before dancing to DJ-spun tunes. The event also includes a knockerball, food trucks, and zumba.