About 30 minutes before exercising, drink eight or more ounces of water. Acclimate your body to the heat. When the thermometer begins climbing, reduce the duration or intensity of your exercise. If you typically walk for 60 minutes, cut back to 20 and then add five minutes every two or three days. As your body adapts to the heat, its internal temperature regulator will work more efficiently, prompting the sweat glands to work faster and making your workout more comfortable.
Common sense dictates that as the temperature increases, the amount of outerwear required decreases.
Better still, dampen your clothing with a misting bottle or by getting your shirt wet and then wringing it out. Just like sweating, the evaporation of the water cools the body. With a little planning and conditioning, your body should easily tolerate the dog days of summer. But if you find that shorter jogs, fluids and wet t-shirts aren't cooling you off, take your workout indoors, or do your daily laps in a swimming pool rather than on a running track. Just remember, the heat will break sooner or later.