Running 42 kilometers, known as a full marathon, is a high-intensity sport. This activity is beneficial for heart health and the circulatory system, but it also carries risks, one of which is dehydration due to the significant loss of body fluids through sweat. This fluid loss can disrupt bodily functions, so adequate intake of water and food is necessary to restore the body's condition. One effective way to replenish energy after exercise is by consuming isotonic drinks.

  Why are full marathon runners advised to consume isotonic drinks?

  Why shouldn't the drink be too watery or too thick?