 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. Wow, totally opposite directions for the blood to flow. Well, what do riders do to cool themselves down? Yeah, so the first thing is they start training to acclimate for weeks before the race. Joao Correa is a former pro cyclist who's now the agent for a few guys in this year's tour.