I am a large person with Fibromyalgia, Chronic Fatigue Syndrome, a herniated disk, and knee problems. My brother had told me of a friend who had good results with yin yoga. I searched for a long time for a book of yin yoga but all the photos were impossible for me to even attempt! YOGA XXL was the answer to my search. The author has lots of clear photos, notes indicating any counter indications for a pose, and lots of good ideas to make the exercise work. I'm really happy with this book.