Published April 24, 2018 05:48PM

'David Weekly'
If a 1,000-mile run doesn’t sound hard enough, try the Iditasport Impossible: This ultramarathon covers Alaska’s Iditarod Trail from Anchorage to Nome–in winter. Boulderite Jorge Rufat-Latre completed the feat this year; here, he talks motivation, mental toughness, and eating pounds of chocolate-covered cookies.