Why athletes should drink solutions that are isotonic to body fluids rather than ones that are hypotonic to body fluids?

Athletes should drink isotonic solutions because they closely match the body's electrolyte and fluid balance, allowing for optimal hydration and quicker absorption during intense physical activity. Hypotonic solutions, which have a lower concentration of solutes than body fluids, may dilute electrolytes and lead to imbalances, potentially causing issues like hyponatremia. Isotonic drinks help maintain performance levels by replenishing lost fluids and electrolytes without disrupting the body's natural osmotic state.