Kilian Jornet set the world speed record for ascending and descending the Grand Teton on Saturday, August 12.
He made the climb in 2 hours and 54 minutes, beating the previous time of 3 hours and 6 minutes, which was set by Bryce Thatcher in 1983.
The route he took was Lupine Meadows to the summit and back, totaling 7,482 vertical feet and 12.5 miles.
You can get a good idea of how Jornet makes the climb by watching this video. It is of him making a similar ascent and descent of Grand Teton on July 31, a trek which took him 3 hours and 23 seconds.