Tao of Life Tele Study

This month’s book selection is from Matt Nelson.
Section 38, pp. 28-30 (hard copy)
I was inspired by this selection because I have noticed breathing has a tremendous impact on my energetics. I notice that during the day when I get involved in tasks, I can start breathing very shallow and quickly. I need to intentionally correct my breathing patterns and when I do, my energy is resurrected and I have a better perspective. I was questioning the breathing technique under "C." Doesn't appear to have any reference other than to hold your breath. I would also like to know why this technique is recommended for people who are internally weak and if it is superior to the other methods listed.