After reading everyone's answers, it seems that staying up late to exercise = destroying recovery = not worth the candle. But the question didn't mention whether there was a limit to the rest time. I think:

1) If it's just the time difference, there's no problem at all. When I was in college, I liked to go to the community gym for training at around 1 1 in the dead of night. I am very focused and will not be interrupted, so I get twice the result with half the effort. Because I can sleep until the next day 10, I recover quickly and have a high quality of rest.

2) Under the condition of insufficient rest time and good health, the benefits of training are also greater than those of not training. An extreme example is that when I was in the third year of high school, it was 1 1 every morning and evening, but I still had the habit of doing pull-ups and push-ups myself at night, and my physical fitness also improved to a certain extent. If you don't have enough rest, it will really affect your training and recovery, but as long as your body is normal, training is always much better than no training. Training itself will also speed up metabolism, which is very beneficial to relieve nerve pressure.

However, it should be noted that the training intensity of weightlifting is very strong, and nerve fatigue will soon accumulate, which requires a high sleep. Muscle fat large-scale bodybuilding training is not limited, and low-intensity training and aerobic training are even beneficial to reducing stress hormones.

Conclusion: It leads to decreased immunity and many maladjustments. The decline of immunity will destroy our function and our health, and finally lead us to get sick easily Adequate sleep is very necessary for fitness. It is wrong to focus only on training and ignore rest. Because strength training will destroy muscle fibers, and muscle growth occurs outside of training, rest will help muscle recovery; In addition, some hormones in the human body can promote muscle growth. These hormones are secreted to the highest value in the middle of the night, which is the best time for muscle growth. Keeping enough sleep, scientific fitness is the most effective.

Then when we are training, our sports state will be greatly affected, and you will feel that you can't play, and the whole person is confused, so it is difficult to enter the correct training state. Therefore, bodybuilders must quit the bad habit of staying up late in training and keep their bodies in good condition, so that the training effect will be better.