Personally, I closely watch the DTF riders and try emulate their riding style. I see them rock their hips a bit, wiggle slightly, and move their shoulders a small amount with a natural efficiency, fluidity, and form. The degree changes depending on the nature of the riding they happen to be doing at the time. They don't flail and they don't expend energy needlessly trying to constrain motion based on some half-baked theoretical notion. That's my approach anyway.