Chi Running: Have you read this book?

I picked up the book, Chi Running by Danny and Katherine Dreyer, two months ago with every intention of diving into it immediately. Unfortunately, life became busy and I hadn't had a chance to even open the book until this week. I am happy to say I have finally started to read this book! I'm curious if you've read it. What did you think? Did you change anything for yourself? Have you seen improvement? If so, how?