Drinking water before and after exercise is more particular. As we all know, when you exercise, you have to sweat a lot. Water will run away. If you wait until you are thirsty to drink water, you will lose your balance. So you should drink water before exercise.

After exercise, you will lose sweat and some electrolytes at the same time. Therefore, after exercise, when drinking water, you must drink a small amount of water many times, and don't drink a lot of water at once. Because your body temperature rises after exercise, you have to sweat and drain water, so drinking a lot of water repeatedly can easily lead to water poisoning. You can't just drink boiled water or water after exercise, you should add a little salt to it. If you drink a lot of boiled water immediately after exercise, there is no electrolyte in it, and water will enter brain cells, causing brain cell edema, dizziness and vomiting, and even mental symptoms.