This is a fantastic book, which has provided me with motivation, guidance and inspiration between my weekly beginners yoga classes.
More advanced yoga practitioners would also find this book useful because, as well as providing well set out, easy to follow, clear and attractive instructions on most asanas (poses), the book also puts yoga in its wider context, with sections on philosophy and yoga text.
Within the book, the asanas are broken down into really logical sections: eg. standing poses, seated poses. Each asana has guidance on how to practice, with very clear photos, and guidance on how to get more out of a pose once it has been achieved.
I would say that this is an essential book for yoga practitioners at any level!