OK, I'm getting ahead of myself. This book is about running with a more efficient stride for long distances. It teaches you to sense what your body is doing while running and to reposition, realign, and rethink which muscles to use to run. Like Chi, everything comes from the center. You use your stomach muscles to lift your upper leg by pulling from the opposite shoulder. Hip flexors too. All the rest is bones and ligaments. You allow your foot to fall directly underneath the center of your body, not forward, which stops momentum. You lean your body more or less forward to control speed. It does actually work quite well.
In reading the book, you will find all the pertinent muscular and bodily control information in chapter 4. Chapters 1-3 are somewhat fuzzy and consider the history of Chi. It's all vague and smacks of ancient Chinese religion until chapter 4 ties it all together.