Handy little thing, but by virtue of it being so little, quite limited. A couple of poses I wanted to look up weren't in here at all. It has a lot of information on what yoga is and why people practice it, but not many poses. One handy thing it has is a little box suggesting the benefits of each separate pose, and also who shouldn't do the pose (e.g. people with high blood pressure, people with wrist injuries, etc).
An excellent pocket book that that let you learn essential yoga postures in a clear way by explaining all benefits for each posture and what is it for. Also breathing...I really like it