"I would oftentimes be so out of breath that I would almost pass out, " he said.

CNN: From 'sumo wrestler' to distance runner

"When you're disoriented because you're out of breath and tired and you think you're one mile away, you could be potentially three or four miles away, " Muir said Wednesday afternoon.

NPR: 1 Calif. Hiker Still Lost, 1 Found And Recovering