This year's Tour de France began over the weekend under extremely hot conditions, which is a growing concern as climate change makes European summers hotter.
NPR's Alejandra Borunda spoke with Julien Periard, a former triathlete-turned-exercise physiologist at the University of Canberra in Australia, who says everything feels harder when riders are heat-stressed.
So to keep pedaling hard, a rider needs to send tons of blood to their heart.
But to cool down, their blood needs to go toward their skin, where sweat or wind can cool it off.
"It's this competition within their own body," says Borunda, "where sweat or wind can cool it off."
So riders start trying to acclimate for weeks before the race.
They warm up wearing cute little ice vests, for example.
They ride in the shade with fans blowing on them, and they sometimes shove nylon tights stuffed with ice down their jerseys.
During the race, they dump bottles of water over their heads.
And they try to sweat perfectly.
Then they go into a sauna afterward.
Finally, they train in the shade with fans blowing on their bikes.
But it's not just cycling that's struggling to deal with the heat.
British cyclist Mark Cavendish threw up on his
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