At first blush, a Zombie Run would seem to be a pretty relaxing way to spend a day, given the undead's typical staggering gait.
But some of the activities at Saturday's Zombie Run at City Park were paced more like World War Z and 28 Days Later than The Walking Dead, providing participants' corpses with a real workout.
See for yourself in this sampling of pics from photographer Brandon Marshall -- and click to view the complete Zombie Run at City Park slide show.
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More from our Things to Do archive: "Photos: Top thirteen best free day trips from Denver."