Paul has been a Qi Gong and Tai Chi student of Master Bruce Frantzis for, I believe, 3 decades and a teacher for at least 2. I have taken online courses from both of them. I enjoy Paul's teaching because he has thoughtfully and meticulously broken every movement of the forms he teaches down into its ideal submovements and has developed effectives ways to teach people every minute detail -- and there are lots in internal or martial arts! Paul truly is a masterful teacher, and I find myself going back to even introductory video lessons and learning new things.
What does that have to do with this book This book captures 42 principles that Paul teaches as they relate to movement in Qi Gong and Tai Chi related to our mind, how we stand, how we move. This is a book of philosophy as much as it is of proper form, and as your practice grows those two things merge.
Anyone practicing Tai Chi or Qi Gong will benefit from this book. Paul provides precise and detailed explanations that are suitable for a beginner but also deep enough for an experienced practitioner.