The
Yukon Arctic Ultra, which holds marathon, 100-, 300- and 430-mile races for runners, mountain bikers and cross-country skiers, has been called, "The world's coldest and toughest ultra!" Race director Robert Pollhammer suggests training for a race like this—where the average temp is -10 F, and temps have reached as low as -70 F—by taking "Long runs and walks. Pulling a sled or tires. Trying to train on sand and snow."
