In 2006, Karnazes participated in the Endurance 50:50 marathons which means he ran 50 marathons in 50 consecutive days in 50 different states. Most races are held on the weekend. So, Karnazes had marathon officials follow him around and track his marathon race to make sure it was accurate. He was only at the live marathons in 8 of the states.
The others he had to have officiants track him and it counted towards the marathon that state was having that coming weekend. So, he'd run the official course, but not with all the other runners. Over the 50 days and 50 marathons he only fluctuated down one pound in weight.
After finishing the 50/50/50 races in New York City, Karnazes thought "hey what the heck, I'll run home to San Francisco." Literally. It was nearing Christmas, though. So, he only ran from New York City to St. Charles, Missouri. From there he caught a plane so he could spend more time with his family for the holidays.
A film has even been made about the saga. Some of his other accomplishments include running 350 miles in 80 hours and 44 minutes without any sleep, running to the South Pole in -13 degrees Fahrenheit without snowshoes, and completing The Relay- a 199 mile run eleven different times.
