I used to despise discomfort, but since I started running regularly a few years ago, I've gotten used to being comfortable with being uncomfortable, and that "lesson" has extended helpfully to other non-physical areas of my life. The studies say "physical activity boosts short-term brain function and heightens awareness. And even on days when athletes don't train. . . those who habitually push their bodies tend to confront daily stressors with a stoic demeanor." I suppose you could read the Meditations and learn the same lesson, but there's something about being physically uncomfortable that really drives the point home. This article reinforces the idea that fitness goals -- like running a marathon -- aren't a waste of time, and that exercise makes you a better, higher-performing person. "Pushing through is courage. Pulling back is regret."