Updated Sep. 21, 2024 at 3:50 p.m.* HAMBURG — There was skepticism surrounding the Tour de France 2023: Could Danish cyclist Jonas Vingegaard really be that fast? So much better than the others? If so, how? And because there was no other explanation, some cycling fans focused on one number for a few days to explain his performance: Vingegaard’s VO2 max value. For the latest news & views from every corner of the world, Worldcrunch Today is the only truly international newsletter. Sign up here. The VO2 max value is one of the most important performance markers in endurance sports. It indicates t…