Marshall Ulrich & the Badwater "Quad"

There is a 146-mile running race from the minus-282-foot bottom of Death Valley to the 14,496-foot top of Mount Whitney, which is bad enough. But Marshall Ulrich needed to make it more of a challenge.

He decided to run a quad Badwater 146. Nearly 600 miles of running from the lowest point to the highest point in the contiguous United States, and back. Twice.

Up and down, up and down.