Above tree line the "conga" line is slow, If you were not able to get ahead of it you just travel with it. I run through town and the flats, about 85% of the race for me is power walking. If you can walk 15 minute miles you get to the top in 3 hours and 20 minutes. That is fast for the average runner. Treadmills are a great way to train the incline work builds the right mussels. Most runners power walk.