Barre Exercises and Structure is a book in the educational series by the Fonteyn Academy Press. It accompanies the Academy Method International Teacher Certificate training program, but is quite helpful to all instructors and students of dance.

Each and every exercise in a classical dance class has a specific purpose. Knowing that purpose will help achieving the highest level of dancing possible for you.
The Academy Method is taught at The Margot Fonteyn Academy of Ballet. It is based on the fundamental principles of movement as they apply to classical theatrical dancing. Carrying forward the teachings of Margaret Craske, and her students, this is what Dame Margot Fonteyn herself studied so long as she was dancing.

Every single movement in classical dancing is derived from the steps practiced at the barre. This book explains that relationship, and gives dance students precise knowledge of what they are to do, why they do it, how it will help their dancing, and exactly what is required of them.