Stimming, nervous habit, or other?

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So I've done this "thing" since I was fairly little, and it appears to be so atypical (even for WP) that I'm completely unsure if this constitutes a stimming behavior or not.

I subtlely, simultaneously, and symmetrically move something (ligaments, tendons?) in each shoulder which achieves the effect of temporarily dislocating my shoulder inwards. It doesn't hurt. Then I release whatever it was I dislocated and pop both shoulders back into position, making a very subtle gutteral sound that's synchronized with the popping sound.

Sometimes I time this behavior with something that's happening in real life, such as walking over a sidewalk crack, or doing it right before my body crosses a particular perpendicular plane.

I can't say that I do this to calm myself, necessarily. I certainly can control it, but often it just "feels right" to do it. And I don't do it all the time, just occasionally.

Is this just inexorably weird? Anyone else have similarly complex behavior?

I have read somewhere - in my many ASD travails - and do not ask me where as I cannot remember - that lax joints and lax muscle tone can be a feature of ASD's.

It is a feature in my family. My brother kind of "dislocates" his double jointed shoulders, not with quite the same acumen as you describe (i enjoyed the detailed description,) but he does some funny things with them. Others in my family have abnormally high levels of suppleness and stretching capacity. I do, as if there is no resistance to bending and stretching and hence the need for weighted things and pressure and the need for firmness and pulling and deep pressure. My ASD psych suggested i get one of those racks where you lie down and can hang upside down to stretch the body out. one day when i can afford it, i will buy one.

Wait so being flexible can be an AS trait?? Wow, I'm really flexible. That's one of the reasons I've been succesful at ballet. I'm more flexible than about any boy I know and a lot of girls too. Add that to the list I guess.

It can be described as stimming if its purpose is to stimulate yourself: self-stimulatory behavior.

I have the same thing with my shoulders, but for me, i like to watch them when i do it!
totaly hypnotised by the shapes they make, i also do a similar thing with my legs, tensing and relaxing the muscles just to see the shapes they make as well!

my legs just shake when i sit down.. there are other stims but this one is really obvious to others.

Cool information. I didn't know that double jointedness was an AS trait.

I do that exact same thing, but with the big toes on my feet. It really creeps out my mom if I'm standing on something that amplifies the sound.

I'm also deffinately more flexible then I should be in some ways. My doctor says I've for hyperflexable ligaments, but the rest of me isn't so it causes me some problems. My knees and shoulders are slowing destroying themselves because of it and it makes it really easy for me to get muscle and tendon injuries

I crack my fingers alot and bend them aorund. But I'm not flexible at all, I'm really stiff lol.

I'm not flexible. Even when I was 18, taking martial arts, and trying to do the splits I could never even get close.

I do have double-jointed fingers, however. I wonder what the incidence of this is in the general population so we have some basis of comparison.