Hello, I can see your problem in other places. According to your description, it is a symptom of hypoglycemia, which is normal. I tell you, in fact, everyone has clinical manifestations of hypoglycemia, which is only a serious or slight basic manifestation. I think you are a little biased, so I suggest that you don't do strenuous exercise before eating food, that is, before fasting. This will not only have no effect on your physical training, but also affect your stomach. It is known that gastric acid is secreted in your stomach on an empty stomach. It is alkaline and corrosive. You don't eat anything. After strenuous exercise, you secrete more stomach acid, and there is nothing to absorb in your stomach. You can only absorb your stomach for a long time. Thank you. If you don't understand anything, you can always ask questions next time.