You can drink water 30 minutes before training, but don't drink too much. You'd better take a sip to moisten your throat. The closer you get to exercise time, the less you should drink alcohol, so as not to increase the burden of gastric motility. You can drink it 30 minutes after training, but don't exceed 250ML each time. Because the human body can't absorb too much food in a short time, it is reasonable to drink it at least once every 30-60 minutes. Don't eat for three hours before study. You can eat fruits, such as apples and pears. The reason why you can't eat it is because many postures will squeeze into your stomach and make people feel uncomfortable. You can eat it afterwards, but you should also eat less.

It's ok to drink water, but you should avoid getting upset after drinking too much.