You may be bundled up during the polar vortex that’s sweeping the nation, but for some outdoor enthusiasts, it was the perfect temperature for this year’s Arrowhead 135 ultramarathon. The a race is purposely held in late January or early February each year to line up with what they hope is the coldest temperatures of the year. It runs roughly 135 miles between International Falls, Minnesota, to Lake Vermillion in Minnesota along the arrowhead State Trail. This year, they were right on the money, as temperatures dropped as low as -30 degrees Fahrenheit. “It’s supposed to be coupled with this...