Common symptoms associated with heat illness include light-headedness, confusion, weakness and loss of coordination. The key here is to exercise within one's limits, which means people who haven't exercised for a while should start slowly, work at their own pace and progressively increase the tempo of their workout. It may not be the best idea for a student to start exercising using a fast-paced exercise class. Using a spray bottle on the face to keep cool is likely more of a psychological lift than a physiological aid. And be aware that adding too much water, to the point that it drips off, may impede the body's cooling process.
Heat is removed from the body when sweat evaporates.
This is why wiping sweat from the body is also discouraged during exercise. Throughout her 15 years of teaching aerobics, she has observed that she sweats a lot. She recently had a blood test that included potassium and sodium levels and was subsequently placed on a supplement because these elements were low. As a result, she is feeling much better and less tired. Her question is whether or not other people who sweat a lot should be taking a supplement.