There are three centers of intelligence within each of us. Head, Heart and Gut. This book is based on the idea, realized by Don Riso and Russ Hudson, leading developers of the Enneagram, that we have a tendency to be more oriented toward one of these intelligences and also to neglect one of them. This was particularly exciting to me because as a yoga instructor I know that I could then recommend an optimal individualized yoga practice based on these principles.