Staying hydrated is tougher when you exercise, because you sweat due to the physical effort you put in the workout. Athletes have to avoid getting dehydrated when they exercise to prevent heat illness, for example. Heat illness occurs when the body gets dehydrated, because the body doesn’t cool itself effectively anymore during the exercise in hot summer days. On the other hand, if you drink more water than the body needs while exercising, hyponatremia can occur. Hyponatremia appears when there is too little sodium in the body, the cells beginning to swell with water. Even if it’s a rare condition, avoid being one of the few unlucky people to suffer from it, especially if you participate in endurance activities, which present a higher risk of hyponatremia than other exercises. Therefore, being an athlete isn’t all about exercising to stay in the best shape you can, but it’s about providing your body with the proper level of hydration for you to keep good health as well.