The purpose of an isotonic drink is to improve the intake of water, minerals and nutrients to facilitate the replacement of what the body uses during effort. It facilitates rehydration, while contributing to the proper assimilation of the particles needed to support effort (glucose, sodium etc.). Isotonic drinks contains similar concentrations of salt and sugar as in the human body. Quickly replaces fluids lost through sweating and supplies a boost of carbohydrate. The preferred choice for most athletes, including middle and long-distance running or those involved in team sports.