Let's talk about the bad places first. For his own purposes, the author belittles the modern fitness and equipment training in the gym. The limitations of self-respect are obvious. For example, pull-ups require the cooperation of multiple muscle groups. Many people can't do a few. It may not be that their back strength is not enough, but that other strength is not enough. For example, my grip strength is not enough, but the training of grip strength in the book, that is, the use of towels, is really slow. I went to learn how to use barbell to do forehand flexion, dumbbell hammer, and the way to twist barbell with forearm strength. The forearm is much thicker, which solves the problem of grip. Whether I do pull-ups or barbell dumbbells, it is much more convenient, which shows the limitation of self-weight. Self-weight training is a multi-joint and multi-muscle group exercise, but equipment training allows you to exert strength on a single muscle. That's the point.
Besides, the author is not honest enough. The so-called demonstration action of one-handed push-ups is against mechanics. One-handed push-ups have three support points, and the center is obviously beyond three points. It is impossible not to stretch your legs. You can see Bruce Lee stretching his legs.
Tell me a good place. Self-weight training is really outside the equipment, which is comprehensive. As mentioned above, you need the cooperation of multiple muscle groups to improve your physical performance. For example, parkour and street fitness are two extremely high self-esteem realms, such as violent climbing, the level in front of the horizontal bar, the wind flag and Russia. Many gym muscle men can't do these acrobatics, so self-weight training is convenient.
Sports pursue different things. Some people, such as parkour, pursue that kind of excitement, while others pursue physical beauty. There is no need to denigrate each other for their own purposes. For example, bodybuilders may say that parkour people are in poor shape, while parkour people will say that bodybuilders' muscles are useless, with different starting points and different pursuits, which is equivalent to telling chickens and ducks that there is no right or wrong. Why slander each other and give personal advice?