Click here for more articles by Kormedi.com. As heat waves continue, it is easy to put off exercise. But rather than avoiding exercise altogether during the summer, it is better to properly manage the timing and intensity of workouts, as well as hydration and electrolyte intake. During periods of intense heat, even a workout that is normally manageable can lead to exhaustion or heatstroke, making it essential to follow basic safety guidelines. Avoid the hottest hours The safest times for summer exercise are when temperatures are relatively cooler, such as between 6 and 9 a.m. or in the evening after sunset. Outdoor exercise should be avoided between 11 a.m. and 5 p.m., when ultraviolet radiation and radiant heat are strongest and body temperatures can rise rapidly. When a heat wave advisory is in effect, or the perceived temperature reaches 33 C or higher, reduce your usual amount of exercise by about 20 to 30 percent. Instead of high-intensity interval training or long-distance running, opt for activities such as walking or slow jogging that keep your heart rate relatively low. Stop exe