I was disappointed with this latest addition to ashtanga "guides". The author is not a practitioner and hasn't studied with P. Jois. Consequently, much of the "advice" is incorrect or downright silly. Example: "Ashtanga is a practice for 20-40 year olds." Evidently, Guruji didn't get that message and I wonder where the author got it.
Look for John Scott or David Swenson for sound guidance and instruction.