It's not that the fitness is too fierce, but that the fitness must be sore to be effective! There is no problem of being too aggressive.

Second, never practice sore muscles again, because it will destroy the rest and growth of muscles. This is the principle, you can practice other muscles that are not sour. This is the most basic principle of fitness.

Third, don't think that "continuing to practice sore muscles" is an effort, which is just nonsense from people who don't know how to keep fit.