This is a comprehensive book on teaching Hatha yoga. The book is brilliantly laid out. It has everything you need-anatomy, anatomical terms, instructions, illustrations and benefits, modifications and cautions for each pose, answers to issues we face as teachers that would only be learnt through experience. Its is clear and concise. It does not illustrate all postures but most that are regularly used. The anatomy is detailed at the exact right level. It also tells you the muscles working in each pose which is extremely useful.There is alot of information hidden on important aspects of yoga. It also gives sanskrit and english translation for poses. If you are teaching Hatha yoga or learning you really must buy this book, if its not a huge learning tool, it will be a very useful reference!