40 Below: The Toughest Race in the World

"Run, bike or ski, you have to make it 135 miles in the coldest, most desolate area in America, in the dead of January."

What is the Arrowhead 135? Nothing more than one of the toughest, most dangerous races in the world. Run, bike or ski, you have to make it 135 miles in the coldest, most desolate area in America, in the dead of January. And the participants wouldn’t change a thing.