I never got to talk to an elite long distance runner, so all my conversations were people who run sub 3 or around 2:40. They all tend to underestimate the treadmill, and even on a disgusting cold windy day they run outside, as though a workout on a treadmill is a wasted workout. Why is that? I run both outside and on a treadmill, and mechanically I can’t see any significant difference. The treadmill is great and can give you great workouts and great shape. I’m not saying only treadmill, but why not use this great asset? They tend to say that they would only run on it as a last option. Is this some kind of showing off by sub elite people?