Tour de France and the extreme adaptation to physiological demands
https://www.washingtonpost.com/news/early-lead/wp/2017/07/19/i-think-my-legs-look-tired-a-tour-de-france-cyclist-shares-a-shocking-look-at-the-toll-the-race-takes/?utm_term=.baf4e550c462
‘I think my legs look tired’ Tour de France cyclist provides a disturbing example of how far human bodies can adapt