" As runners, we tend to think in exchanges and zero sum games: If I finish this race, I get a medal. If I run 10 miles today, I’ll have earned this burger. I have to hit these splits, otherwise, I failed. But sometimes, the things we get out of a run are far more abstract than a piece of tin to wear around our neck or a set of numbers on a stopwatch. A run can take us to places and people we would otherwise never have the opportunity to encounter. "

― Susan Lacke , Running Outside the Comfort Zone: An Explorer's Guide to the Edges of Running