According to what I read "Isotonic" literally means "equal tension." It means that two substances have the same concentration of a solute. So in the case of an ' isotonic drink' it means that it contains the essential salts and minerals (electrolytes) in the same concentration as in the body and it is intended to replace those salts and minerals (electrolytes) lost as a result of sweating during vigorous exercise. Fitness enthusiasts and professional athletes understand that there are 2 crucial factors that help achieve exceptional performance they are 1) energy and 2) hydration. Just a 2% loss of fluid during exercise or mild dehydration can significantly harm performance and for exceptional performance water is simply just not good enough which is why the isotonic drinks market is booming.
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