I used to do this when I was in middle school. This is the reason why you are weak. Let me give you some advice.

1. Strengthen physical training by running and jogging every day, but if you persist, your physical reserve will increase a lot after one month.

2. Pay attention when playing ball. You'd better do warm-up exercises before you start. If you don't do it, start to pass more balls as a warm-up, pay attention to the distribution of physical strength, break through the passing combination, cut more short passes, and don't always break through too much physical strength; Pay attention to your position when defending, and don't always run around and stare at people, which is too tired and inefficient.

3. It is recommended to drink sports drinks after exercise, such as pulse, to replenish energy, and not to drink coke.

Don't eat immediately after exercise, take a shower and chat before eating.

Among these suggestions, strengthening physical exercise and paying attention to body distribution are the key, and excessive overdraft is not good for your health.