It all has to do with how the body works. Every living cell uses sugar in your body as an energy source to do what ever job it was designed to do. The consumption of sugar generates heat as a by-product
And the conversion of sugar to energy/work is why the body is ~98 degress. When you run or perform physical activity, your creating a lot of energy with creates a lot of heat, the heat gets spread thru your body by your blood.
That's why we sweat, to cool off that blood that has been heated by our bodies at work. That cool blood then cools off the rest of the body as flows thru
If a body at work can't cool off, a persons can suffer heat stroke where the body goes above 104 degrees, once you get to that point, damage starts to occur to the body and it can no longer regualate it's own temprature.
At 108 degrees, the body shut's it's self down and death occurs.
That's why people complain about the heat, it's an NT response to a built in self-defense mechanisim in the body where we tend to get lethargic when it's hot out. Simply put, it's to keep us from overheating
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