The best way to prevent heat exhaustion while exercising is
D) Avoid exercise in extreme heat or humidity
While working out in the summer in a non-air conditioned place isn unhealthy and not safe. Doing this can lead to a stroke or heart attack. If it is already hot and you are adding on heat, that overwhelms the body. This action should not be done while exercising. Make sure you have a cool temperature building and are drinking lots of water.
