When the heat stress index rises above 90 o F, you may want to consider postponing your exercise session until later in the day. Or, plan ahead, and beat the day's heat by working out early in the morning. Fitness Physical training and heat acclimation can increase your blood volume, helping to regulate body temperature more effectively. Interestingly, the acclimatization process can be completed in 7 to 14 days of repeated heat exposure. However, you must always continue to drink fluids before, during and after exercise.
Clothing Wear minimal clothing to provide greater skin surface area for heat dissipation.
Your clothing should be lightweight, loose fitting, light colored to reflect the sun's rays, and of a material that absorbs water, such as cotton. Rest Know when to say 'no' to exercise. Using common sense is your best bet for preventing heat stress when Mother Nature turns up the heat. Heat stroke possible.