When muscles are moving, it is the human body that is tearing hard, forcing muscles to contract and damage them within a moderate range. Your intuition is that your muscles are congested and swollen. In fact, this is just a muscle strain, and the muscle itself has not increased. When you stop exercising, the human body has the function of self-repair, and protein will provide it to all the damaged muscles to make them recover. This kind of muscle compensation is human instinct, and it is overcompensation. The so-called overcompensation, for example, if you cut a hole in the skin, will there be a protruding scar after it is completely healed? This scar is the result of overcompensation. In other words, the human body not only repairs physical defects, but also overfulfils tasks. Bodybuilding training is based on this theory. Unfortunately, many people don't understand, relying on youth and arrogance, but they have achieved nothing.

From above, you should know the importance of rest. So, how to rest? Under normal circumstances, a part of the muscle needs at least 48 hours of recovery time, and some large muscles even need 72 hours of rest after more than a dozen groups of high-intensity training. In other words, you should never practice until your muscles are restored. But abdominal muscles and calves can be practiced every day because their muscle cells are special. Space is limited, so I can't elaborate.

In short, the muscles in the same part should be practiced at least once every other day.