Bob and Sass reconvene after the Christmas in July sufferfest to unpack a 21-hour, 100K death march through 86-degree heat and a dew point that refused to drop. Burger King at midnight, a near heat-stroke timeout, a lightning-chased final lap, and three big lessons about shoes, legs, and pacing. Plus: a full survey of the world's stupidest winter ultras, ending in talk of running across the frozen Bering Sea.