I find, as I get along with my practice, that Asana filled with emotional content seems to be better asana; without it, exhalation deflates my chest and dampens my spirit more, and with it , I maintain the energy and spirit of inhalation with a high broad chest and have the relaxation and openness of exhalation. I am guessing that many here have noticed the difference emotion makes to how well you stretch and unify. I would be interested in hearing specifics and what styles emphasize this. Namaste