Tangent: there's a great history on modern yoga ... huh, I forgot the title of the book. It is in my Kindle library somewhere. The book talked about how various

Tangent: there's a great history on modern yoga ... huh, I forgot the title of the book. It is in my Kindle library somewhere. The book talked about how various yoga teachings came into America, starting as far back as Ralph Waldo Emerson. It also talked about some of the distortions of Tantra from India when it came out to the US. Christopher Wallis's Tantra Illuminated has a section on the history of classical non-dual Shaiva Tantra, and how parts of it evolved (or perhaps, devolved) into the modern yoga, which then got imported into America.