During a typical grand prix, drivers can lose 2 to 3 kilograms in sweat alone, depending on their weight and height, and as much as 4kg in Singapore for taller drivers.
You take small opportunities throughout the season to push a bit more. So it goes back to having data from previous years.
Drivers' bodies are managing an intricate balancing act: they must be strong enough to withstand gravitational forces of up to about 6G, while still light enough so as not to be additional ballast in the car.
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