ARM Rotation

Dear ALAN I recently read about the arm rotation-in this article it said that in order to move faster from one side of the piano to the other,or in big leaps in general ,using the arm rotation is more effective because it is a faster move than just taking the arm still from one side to the other. Do you have any thoughts about that? I was wondering does it have to do with using less muscles...?

Watch chapter 6 on my DVD for all about this important topic. When was this article written? It could well have been using my material as a source, as I have been writing about this for over ten years... AFF