Hula seems to use similar movements to samba. Hips and legs move freely while the upper torso of the instructor stays in good posture. What do you think? You can see a clip of the video I am thinking of starting to use here: http://www.collagevideo.com/workout-video/hot-hula-fitness-with-anna-rita-sloss-6288.
Edited to Add: Now I have done the video. I think it could be good for using the inner corset and moving the hips. She does say to "tuck" once but I don't know why--you cannot tuck and move your hips like that. She emphasizes weight on the heels. Instructor has amazing posture; everyone else, not so much.