I feel like runners have this weird quench for fatigue that can only be satisfied by pushing ourselves past our pain threshold daily. This intense craving for the aching of our legs and burning of our lungs. And the most frustrating runs are the easy days, when we're forced to run within our comfort zone. It's no wonder people think we're insane. But we simply thrive off of the post-workout sense of accomplishment and desire for self-improvement.