Hmmm. I liked this book. I have looked literally for years to find what Grilley has termed "yin yoga" and his explanations were interesting and helpful. Until about 70% of the way through the book where he dives very hard into chakras and various methods to dissolve into the universe. Although I don't believe in much of the theology behind it, I don't begrudge anyone the right to delve into something that purports to make you a more self-aware and loving person, and I certainly found the descriptions to be an impressive example of what the brain is capable of creating, believing, and achieving. However, at the risk of sounding like a cultural appropriating colonizer, I really was just interested in the physical aspect, and could see the last bit as being more relevant to people who intentionally seek out theology of reincarnation, Shakti, and chakra energy meditation. All in all a good helpful book that had me singing "Chakras! Chakras!" a la AtLA.