Some young people have thin arms and thin legs. They just don't have all the strength. After doing a little exercise, they were sweating like a pig, because their strength had run out. In fact, this has something to do with the usual exercise. People who exercise every day are definitely better than those who don't exercise, and both endurance and explosiveness will be better than you, so this reason is probably caused by lack of exercise.
In the gym, we can wave to him like rain and have a good sleep when we get home. Sometimes I go out for a run when I have insomnia. After that, there will be a state of fatigue, and people's physiological functions will actively ask you to rest, so that you have no strength to do anything. This is a complete mechanism designed by the creator to tell us when to rest. Don't overload, overdraft will be harmful to your health.
Another possibility is kidney deficiency, not what I said. This is what a master told me. If you say that you have kidney-yang deficiency, you will feel weak and exhausted after doing a little work. It will not only affect this aspect, but also all aspects. You know, I won't talk about it. If you don't care too much, you'd better go and see if your body is hollowed out. Make up, eat, practice and face it with a positive attitude, and there will always be progress.