With the aid of a video supplement, this revised and expanded text applies basic principles of physics to the art of dance and offers an inside look into one of the most appealing and popular of its aspects - the pas de deux. Highlighting the fundamental aesthetics of the pas de deux it conveys an understanding of the partnering process, and supplies an analysis of the mechanical principles that make these interactive dance movements possible - not only in dance but in ice-skating too. Stop motion and sequential photos illustrate the text. Designed and produced to accompany the book, the 30-minute video illustrates the principles of physics involved in dance and specifically in partnered dance. It includes dance movements specially performed by Julie Kent and Benjamin Pierce of American Ballet Theatre and the "Black Swan" pas de deux from "Swan Lake" as performed by Evelyn Hart, Peter Shauffuss and the London Festival Ballet.