Out for a pleasant walk, I stroll. On an afternoon's hike, I stride and sweat. Between classes on opposite ends of campus, I run. To catch a departing bus, I

Out for a pleasant walk, I stroll. On an afternoon's hike, I stride and sweat. Between classes on opposite ends of campus, I run. To catch a departing bus, I sprint. Not everything has to be sustainable. Know the differences, know your limits, be judicious about what you sacrifice for, have good reason for what you do. It's not that sprinting is always bad, it's that trying to sprint 3 miles is bad.