I've seen that drill before, but I don't know. I'm sure it helps some, but I tried it myself, and it didn't feel much like a front hip circle to me. Could have been the tucked aspect. Maybe I should try it piked. I mostly teach it the pike/end part from a position like halfway through the circle (piked around the bar with head at 6 o clock under bar), do three "swings" back and forth, and then "sit up."