I had the opportunity to finally meet and work with Michael Mattesi here in Japan a couple of weeks ago. Michael truly is a great designer and drawing instructor. The concept of using rhythm is not such a 'new' concept in figure drawing but Michael's idea of force is pushing that to the next step by using it as a design tool to inform your drawings.
Luckily we had very good models to work with who understood Michael's theory and actively applied that to their poses.
I appreciate Michael not just because he is a great and encouraging instructor but he really encourages students to think and make design choices as as they are drawing.
It's easy to fall into a comfort zone once you have figured out a method or formula for drawing. It's good for your overall growth and learning as a compete artist to be shaken up and challenged every now and then.