Heat acclimatization is the process of gradually introducing physical activity under warmer conditions to generate thermoregulatory adaptations that allow the body to better cope with heat. Check out this informative video from the Korey Stringer Institute:
In sports most heat illnesses take place early in the practice season. This is due to the fact that most players are not acclimated. The following is a comparison of the heat acclimatization policies for NCAA and High School athletes published by the Korey Stringer Institute.
Shown below is OSHA’s guidelines for acclimatizing workers.