oof my left shoulder blade suddenly said "nope" 🙃
...
a bunch of stretching later and I guess it fixed itself? lol ok works for me
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or maybe the acetaminophen I took finally started working, either way 
I forgot I haven't been exercising in the past couple of months so I did a few curls and whatever that dumbbell held behind your back thing is called
lol nope it was temporary, I think it's a posture thing, but I've got a foam roller and a yoga mat lets see if some Advanced™ techniques help or hinder