Sport Drinks

Most people have had a Gatorade, All-Sport, Powerade, or some type of sport drink before. They see the commercials of athletes drinking them and therefore drink them as well. However, not all people really know what is in them or what they do for athletes. 
Sports drinks are beverages which are designed to help athletes to rehydrate, as well as restore electrolytes, carbohydrates, and other nutrients, which can be depleted after training or competition.
Presently, many electrolyte sports drinks are available in the market.  The only difference for sports and exercise nutrition is in the quantities and the timing of the nutrient and food intake for balanced eating.
So the question is why do athletes use sport drinks in some circumstances over water?
Sports drinks help in rapid replacement of fluid and electrolytes that lost during sports, exercise training or hard physical labor. Also, they help with muscle recovery and soreness, preventing dehydration, and supplying stamina and raised endurance during strenuous exercise.
Sport drinks are mainly of three types: 
Isotonic sports drinks: They contain similar concentrations of salt and sugar as in the human body. 
Hypertonic sports drinks: They contain a higher concentration of salt and sugar than the human body. 
Hypotonic sports drinks: They contain a lower concentration of salt and sugar than the human body.
Among all sport drink most sports drinks are fairly isotonic, having 4 to 5 heaped teaspoons of sugar per five ounce (13 and 19 grams per 250ml) serving. They never have a pH similarity with carbonated soft drinks.
If you would like to read more about sport drinks I found a good website where they have more information. 
http://www.sweetadditions.net/food-drinks/sports-drinks-nutrition-facts-are-they-healthy