 to a certain degree, your heart rate changes, your veins expand, your sweat mechanism gets a little more efficient. You get better at dealing with heat if you acclimate yourself to it for about eight weeks. However, if during that time you go out into the heat for two hours and then you spend the rest of the time in an air-conditioned room, or you spend two or three days in the heat and then you spend two or three days in air conditioning,