For people who like to run, walk, cycle or work out outdoors, summer heat can turn a healthy routine into a serious health risk. As temperatures and humidity rise, the body has to work harder to stay cool. Exercising during the hottest part of the day can further increase the risk of heat-related illness, including potentially life-threatening heat stroke. Dr Laura Marsh, clinical assistant professor at Texas A&M University College of Medicine and director of its sports medicine fellowship, says people do not need to stop exercising in summer, but they need to be more careful about when and how they do it.
