Usually this happens to people who exercise for the first time or rarely. If they don't exercise for a long time, this will happen if they exercise too much. Fitness should be moderate.

Now this situation can only be cultivated. Don't practice twice as much as in the novel If something goes wrong, take a few days off to ease the pain. At first, it should be about 2-3 days, and you should continue to exercise in a slightly sour time.

Usually practice hard, and people who exercise regularly will be fine in 2 days.