A few weeks ago 18-year-old Norwegian cyclist Oskar Svedsen turned heads by doing something no one has done before in the world of physiological testing: he recorded a V02max of 97.5 mL/kg/min. The number surpasses the high water mark long held by Bjørn Dæhlie (96 mL/kg/min), making Svedsen the young new king of aerobic capacity. Whether it has any significance or not, cross-country skiing can no longer lay claim to the best V02max in...