"The Arrowhead 135 race is long, difficult, and bitterly cold, but that’s all part of the fun. Right? Undoubtedly some competitors question this line of reasoning while standing at the starting line of this 135-mile (217-kilometer) ultramarathon in International Falls, Minnesota, a town that routinely registers the coldest temperatures in the Lower 48 and is more commonly known as Frostbite Falls."