Mitochondria have something to do with why some people get younger and younger as they practice. Contrary to some traditional Chinese medicine thoughts, in ancient China, rest was encouraged and static braking was used, and many exercises were done slowly. In modern times, everyone thinks it's good to have more rest.
Although the ancient culture of China is extensive and profound, such as acupoints, acupuncture, meridians and so on. What foreigners have discovered now has existed for thousands of years. Personally, I also believe in Chinese medicine and many traditional health preservation methods, but the more you rest, the more energetic you are! On the contrary, the more you move, the more energetic you are!
Because mitochondria become more and more active during exercise, the more motionless you are, the less active it is. This is why some people lie in bed, the more they walk, the more they don't want to get up, and the more they don't move, the lazier they are. After exercise, I feel refreshed and my learning efficiency is higher.