Drinking too much water, coupled with sodium excretion with sweat, may lead to fatal hyponatremia, commonly known as water poisoning. Drinking too much water can cause brain swelling. At this time, people will have fatigue, nausea, vomiting, dizziness and other symptoms, resulting in insufficient blood volume, brain edema, intracranial hypertension syndrome and other diseases.

In addition, supplementing too much water will cause a serious imbalance in mineral reserves in the body and increase the burden on the kidneys.

The general principles of sports water supplement are "preventive supplement" and "small amount and multiple times".

When exercising, you should follow the principle of preventive hydration and a small number of times.

2 hours before exercise, add 250-500ml of water, 15-20mm before exercise.

Then replenish 120-240ml of water every 15-20min.

The water replenishment interval can be shortened in summer. The water temperature is between 8- 16 degrees Celsius.

In addition, eat a small amount of food 0.5- 1 hour before exercise, so that children have plenty of physical strength in activities.

It is best to rest at least 1 hour after exercise before eating.