See Catarina, I told you there would be other good answers. I read dancelfs descriptions and they seem to be saying about the same thing from a different perspective. No problem, lots of dancers around me seems to use leverage and extension interchangeably. So we can use extension. I may not be very good at dance descriptions, but I promise we don't have any ladies falling over I'm not a dance instructors, but it would seem to me that the reason so many pros emphasis making a clear set point on 4 is so the \/ or \----/ shape can be achieved. With both partners being responsible for their part of creating extension it might be more like \-|-/ where | sets the center point from which which each partner creates their extension. Interesting, my dance instructors all talk a lot about three body centers (head, upper torso, lower torso) stacked like a snowman. I like snowmen. So it is a visualization that seems to stick. I think the tendency is for the \/ position to get exaggerated out of alignment. So moving the lower torso subtly back creates a cleaner extension that is more vertically aligned like you are describing. All I know is there is a distinct difference in the very last moment of creating extension between dancing with ladies that have wcs nailed and those learning it. It is almost a locking in of the extension. Again, we aren't settling away from each other indefinitely until our shoulders dislocate. Aggro swing doesn't come out until way late on Saturday nights at the bar right These two comments seemed to be talking about the same part. So I combined them. OK, she might choose to do something different. The no choice idea wasn't a very good description. However, if we get the compression and extension part going, it sure is easier to be sensitive to smaller leads.