Best photos from the American Birkebeiner

This is the surge of sporting passion that fills the racing ranks of the 41st annual American Birkebeiner (known as the Birkie), and that makes a frigid morning warm with good cheer and anticipation. It may be two degrees. There may be a headwind. And the finish line might be more than 30 miles away, on Main Street in Hayward, Wisconsin. But these racers are raring to go. - Tracey Minkin