Ueli Streck and the Light Workout

But the weather was lousy, so he went for a jog. He ran up and down a mountain near Interlaken three times – eighteen miles, and eight thousand vertical feet, in three hours and forty minutes. (“I enjoy it,” he said. “I feel my legs. I see nature.”) Then to cool down, he went to the gym and lifted weights for two hours. He explained, when I met him for coffee the next morning, that he was taking it easy: he was conserving energy for Nepal.

From The Manic Mountain – Ueli Streck and the dash on Everest
New Yorker – June 3, 2013

The concept that after that run he simply “feels his legs,” seems a bit crazy. I am certain I would be passed out after about mile ten, somewhere on the side of the road.