Avoid the hottest hoursThe 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. Moisture-wicking performance fabrics are more suitable for summer exercise, while white or light-colored workout clothes are usually cooler compared with dark clothes, which absorb more heat. Wearing a hat and sunglasses can help reduce exposure to direct sunlight. Choosing well-ventilated spaces and making use of shaded areas can also help keep body temperature under control. It is preferable to gradually lower your body temperature in a cool, shaded or indoor area before taking a shower.