After stopping exercise, the previous muscles will indeed slowly shrink and fade, but the speed of muscle degradation is obviously slower than the speed of growth. Through lightweight mind control training (mind focuses on training muscle groups) or freehand exercises (such as push-ups). ) has a certain effect on protecting muscles. According to the research, if you stop training for 4-6 weeks and then go back to serious training for one month, you can recover 90% of your grades, so even if you stop training for a few months, you can recover your original grades in a short time.