You've heard of it. You've done it. Or you're doing it.
Nordic skis are sliding en masse toward next week's American Birkebeiner, the largest race of its kind in North America.
As many as 13,000 skiers will kick and glide and freestyle their way through the weekend events. Most will dig deep for the marathon along the Birkie's woodland trails between the northern Wisconsin towns of Cable and Hayward.
This is as much a story about people as it is about the event. Like so many, Ben Popp grew up with the Birkie. First, watching his parents participate. Then, he did the Barnebirkie kids' races — and on up. Now the executive director of the Birkie Foundation, he knows the event is a beacon that casts a lot of light.
"I think it inspires a lifestyle because it is not only a challenge, but there is a really strong social component to it," Popp said. "And I think you put those two hand in hand, it really is a great equation for creating something exciting."
"If you can enable an experience that allows them to really enjoy it and surround them with a social medium that is supportive — then that only facilitates them wanting to do it more," he said. "And then the more and more they do it, the better they feel. Then, they get their friends to do it. It becomes a self-perpetuating circle."
But any Birkie skier knows the work that goes into finishing the foremost event.
"It's a very unique thing," said Talleiv "Tolly" Vollen, 72, of St. Cloud. "It's just something you have to experience to realize the magnitude of it." Vollen, a veteran of loppets across the world, has skied the Birkie 28 times. Alas, a ski-related injury might short-circuit this year's attempt at 29.