This is part two of a two-part story about U.S. skier David Norris who was recently diagnosed with Covid-19. Part one explores how Norris experienced the illness, whereas part two will look into some of the medical literature around athletes and COVID and how Norris plans to build fitness post-illness. You can find part one here. We’re going to start where it counts when considering endurance sports: the heart. This elegant and complex organ,...