Isotonic is a substance disigned to help fuel and hydrate your body during an intensive training.  
 
Isotonic drinks serve multiple essential functions during physical activities:
Hydration: Isotonic drinks help maintain proper fluid balance, preventing dehydration and the associated decline in performance.
Electrolyte Balance: They replenish essential electrolytes like sodium, potassium, and magnesium, which are lost through sweat, ensuring proper muscle function and preventing cramps.
Energy Boost: Isotonic drinks provide a quick source of carbohydrates, the body's primary energy source, enhancing endurance and delaying fatigue.
Rapid Absorption: The balanced composition of isotonic drinks facilitates faster absorption, allowing the body to recover more swiftly.