Although the author says that practice is more important than theory, he spends roughly half the book (all the first 40% and about 10% of the remainder) on theory. And I'm afraid I can't follow his advice not to question or doubt the teaching, because some of it is hoary old myths that I know are untrue. For example:
1. Christianity used to teach reincarnation, but this teaching was suppressed by church authorities (in the ninth century, he says - which given the number of extant manuscripts we have from earlier centuries is just absurd).
2. We only use 10% of our brain. Would anyone seriously claim "We only use 10% of our liver"?
3. Semen contains cerebrospinal fluid. This is an ancient Roman belief based on a superficial resemblance between the two.
Not questioning the teaching (of Hippocrates, Galen and Aristotle) was what held back Western medicine and science for 2000 years.
So I'm inclined to suspect that anything I see in this book that sounds like it's nonsense (like "Wearing green will help with stomach troubles") actually is nonsense.
Also, while he makes a large number of assertions about chi gung, quotes other writers, and mentions a number of "studies" which show the medical effectiveness of chi gung practice, he has no references or bibliography, so it's impossible to check the sources. I'd like to know who did the studies, when, where, and where the results were published so that I could look at the raw data and see if Reid's view of the conclusions is supported by the study; but he doesn't enable me to do so.
I gave it three stars, though, because the practical bit is good. The exercises are well explained both in text and diagrams. And since this is what I was reading the book for, it was worth reading; I just had to wade through a lot of dubious theory first.