I've never run a marathon, but I'd imagine it's trying enough without thousands of volts of electricity coursing through your convulsing, naked frame. Yes, naked—as was the case for Ohioan Brett Henderson. He didn't win the marathon.
Henderson (seen above, clothed) was tased into a heap and charged with public indecency and obstructing official business after refusing to stop running naked in the Cincinnati "Flying Pig Marathon"—I'd insert some sort of lazy bacon joke here, but really, the image of a naked running man struck with a taser should be enough for us all. [Cincinnati.com]