This guy smoked a pack a day just 5 years before doing this, at the age of 40.

Extreme runner Ray Zahab shares an enthusiastic account of his record-breaking trek on foot to the South Pole -- a 33-day sprint through the snow.



In January 2009, Ray Zahab broke the record for fastest unsupported trek across Antarctica, to raise awareness and money for kids' environmental education. In 2006, he ran across the Sahara to raise awareness of water shortages. (He started running 5 years ago.)