http://www.ultrarunning.com/ultra/features/news/jornet-sets-speed-record-.shtml
I know Journet is good, but the math seems crazy. Says Journet did the descent in 1:41. If that is 23.5 miles (same route up and down??) then that's sub-4:20 pace for those 23.5 miles after running the 23.5 miles up, on trails, and at high altitude for much of it. Legit or BS?