text:  And then during the race, it's all about keeping wet. Because when water evaporates off their skin, it takes heat with it. So they'll dump bottles of water over their heads. And they try to sweat perfectly. What? And by that, I mean trainers dial in a rider's exact hydration needs. So they'll figure out, I'm making this up, but it's like Tadej Pogacar, who's one of the best cyclists in the world. He'll need 1.83 bottles of water with 23 grams of carbs and electrolytes on this 12-kilometer stretch of the climb.