Exercise or heat exposure induced excess water and electrolyte loss can threat not only exercise performance diminish but also life. Electrolyte imbalance makes plasma osmotic pressure decrease, fluid outflow increase to interstitial tissue, result in plasma volume reduction. To complement body fluid, it is important that electrolyte balance recovery and electrolyte drink intake. Electrolyte balance is controlled by RAA(Renin Angiotensin Aldosterone) system. Especially, due to increase reabsorption efficiency of sodium ion, aldosterone improves body electrolyte preservation. When body water lost, active RAA system increases water reabsorption, on the other hand, when salt supplied, active RAA system turn down. For maintaining the homeostasis of exercise and fluid balance, the effect of electrolyte drink has been studying widely, however the study about suppling electrolyte drink volume and density in accordance with different exercise type, duration and period has to be continued.