Sweat is good. When you’re too hot, the sweat evaporating on your skin can cool your body off. Sweat also provides a good waste disposal system for your body, getting rid of toxins and other waste products as it cools you down. However, for top athletes who sweat a lot, too much of a good thing can spell trouble. Learn more on this Moment of Science.
As it turns out, all that so-called wisdom about stretching before and after your work out to prevent injury is just a myth.