Fitness Sports Drink vs. Water: Which Is Better for You? By Sports Medicine, June 30, 2014 Performing your best is hard to do when you’re dehydrated. Whether your exercise is recreational or a little more serious, our bodies can become dehydrated easily, especially during the hot summer months. Our bodies are composed primarily of water, and proper hydration allows our body to function to the highest level. Learn more on how to choose between sports drinks and water while working out.