HOT YOGA: Is A Better Cardiovascular Workout

Since when do we do yoga for a cardiovascular work-out? Aren't we going into the yoga room to become enlightened, to de-stress, to breathe?  Isn't the physical practice of yoga a moving meditation?  Don't misunderstand me here, I walked into the yoga room because something inside me knew I was not emotionally or spiritually okay. When I first started …