This isn’t made up magic to sell a product. This is how evolution designed the human body to move and produce power.
What is “magic”, is the idea that practicing planks and conventional exercises that teach the core to NOT move, will magically help you move better and avoid back injuries.
What you don’t move, eventually won’t move. This is why it’s super important to dynamically train the Core Engine in every exercise. Unless of course, you decide to trade mobility and power for rigidity and weakness, which is exactly what Sadhu Amar did in 1972.
Inspired by his deep-seated beliefs, he practiced 24/7 saluting his right arm overhead. After a few focussed months, his fascia/connective tissue took over the task of “stabilizing”, and his arm has been stuck in a salute —immobilized & useless like a dead tree branch—for over 40 years.