Most of the time, Chris Coon is a mild-mannered, low-key pastor at Urban Village Church in Chicago.But when the collar comes off and the running shorts—and especially a race bib—go on, the 49-year-old turns into a different person. An angry one. The things that stoke his ire? Poor race organization. Course volunteers who don’t direct runners at turns. And cars, especially those that don’t yield the right of way or even acknowledge his presence in an intersection. Not only does anger bubble up more frequently when he’s running, he says, he’s also more likely to act on it. “I’ve flipped...