Re: Aikido & Pilates - "Lengthening"
Coming late to this, but my 2c FWIW
My personal impression of why the term "lengthening" gets used by yoga/pilates advertising is an idea of the kind of physical look that is being "sold" (for lack of better term). A "dancer's body" look. Related to a fear of "bulking up", is my guess.
Could I have any more "quotes" in one post -- I'm not sure!