Muscles will gradually "remember" the intensity and consumption of a repetitive and identical action, and then produce reflective and habitual endurance, which is called "muscle memory".
Because muscles have "memory", we will see some people doing the same weight training or aerobic exercise. After a period of time, the degree of fatigue will be reduced, and the performance of fitness or slimming will also be reduced.
This kind of muscle memory is the main reason why many people are getting heavier and heavier in weight training and tired in exercise. Because the marginal benefit of the same component movement is in a "decreasing" state, in order to achieve the same sports benefit, everyone has to desperately "increase" the moving components, weight and time.
On the other hand, if a swimmer who can swim easily for half an hour without rest plays basketball for half an hour, he will definitely feel "super tired". Although it is the same exercise time, the exercise of playing basketball is different from the muscle groups he moves to, and there is no room for muscle memory. Naturally, there is no need to strengthen the exercise intensity or increase the exercise weight, but he can achieve the same or even more exercise effects. This is a very important concept.
Therefore, instead, you can use the memory of this muscle to cheat your body and help you exercise easily. The lighter you practice, the better you practice. When you are old, you don't have to lift heavy dumbbells, and you do exercises that exceed the load, which leads to injuries, sagging breasts and getting fat.
There should be different kinds of sports. When the muscle is about to or has already produced "memory", it is necessary to change the type and position in time, and spend the same time to make the muscle bear different exercises, which can bring different exercise intensity and energy consumption, and can also exercise muscle groups in different parts.