Re: Aikido & Pilates
Lengthening the muscle is actually different to strengthening, When strengthening a muscle you "bulk" it up, it enlarges in it's current shape, it doesn't get noticeably longer - this is especially apparent when you have people like me (tall, with shortish bicepts). Conversely you can lengthen muscles, making them look more 'toned' without having them grow out.
It's the difference there that leads it to be used to market to a primarially female client base - most women don't want to be built like brick shithouses but they do want firm lithe bodies (here here - drool).
Basically the effect leads to natural marketing, rather than the other way around.