I have a possibly unrelated condition that makes my muscles go absolutely floppy if I use them too much. Before I got it, I had a combination of overly low and overly high muscle tone. And I still have spasticity in some muscles (mostly smooth muscle, if I remember the muscle types right).
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"In my world it's a place of patterns and feel. In my world it's a haven for what is real. It's my world, nobody can steal it, but people like me, we live in the shadows." -Donna Williams