Leor Pantilat is one of those people backpackers look at and think is crazy. Equipped with only a minimal amount of equipment and some running shoes, Leor RUNS the back country trails of Yosemite. He also takes some great video like this video he posted on Vimeo of a recent run through the Grand Canyon of the Tuolumne, one of the places most visitors to Yosemite never see.
Great video, Leor.