2. The study of dehydration requires rehydration for recovery. Rehydration provides an opportunity for a novel comparison of renal water retention (urine volume) when consuming equal volumes of two different commercial beverages (Gatorade® or Enterade-S®). Unlike Gatorade®, which is a carbohydrate-based beverage containing electrolytes, Enterade-S® is an amino acid-based beverage containing electrolytes. We hypothesize that the unique formulation of Enterade-S® will improve the rate of fluid absorption and fluid retention compared to Gatorade® in both intracellular and extracellular dehydration trials.