They say the key to surviving extreme heat is to drink plenty of liquids, avoid prolonged exposure to the direct sun, and don't over-do it. But I think surviving extreme heat (or extreme cold) is as much about the head as it is the body. In Joseph Conrad's classic, The Heart of Darkness, Marlowe goes to a French physician to be checked out before his trip to Africa. He received this advice for dealing with the constant heat:
'Avoid irritation more than exposure to the sun. Adieu. How do you English say, eh? Good-bye. Ah! Good-bye. Adieu. In the tropics one must before everything keep calm.' . . . He lifted a warning forefinger. . . 'Du calme, du calme, Adieu.'Still excellent advice: Cool it!