Seventy-two mushers, ages 20 to 63, are racing across the Alaskan wilderness, 1,000 miles in total, to win the prestigious 2017 Iditarod Trail International Sled Dog Race.
For some of this year's mushers, completing the race means more than taking home the title.
Cindy Abbott takes part in the grueling event as an affirmation of life after she was diagnosed with a rare and incurable disease.
Like Abbott, Alan Eischens has a bigger goal than finishing in the top ranks: He races to raise awareness for pediatric diseases. "We do this for kids ... For us, it's about the kids," he told US