Singapore heat, humidity will test F1 drivers' fitness
Briefly

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.
Read at ESPN.com
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