You exist because you perform well in the heat.
At least, that is one line of evolutionary thinking discussed by a 2014 article in the journal Comprehensive Physiology. According to the article, our early human ancestors on the African savannah came to an evolutionary crossroads related to one of our worst traits as a species—they were slower than their predators. Heck, a house cat has a higher top speed than Usain Bolt!
This, the article posits, is where our ability to deal with heat comes in. According to the article, “early hominins in open habitats likely benefited from improved abilities to dump heat in order to forage safely during times of peak heat when predators were unable to hunt them.” In other words, before you were born to run, you were born to tolerate heat and sun.
Read the full article here to understand ways to approach heat acclimation.