No, I haven't had shoulder issues before - but even when I was more athletic, my chosen sport didn't require much upper body strength, so the muscles in my back and shoulders are pretty weak.

Maybe I should email my instructor... I don't want to just push through and hope it will get better while also continuing to put stress on it. Next lab class is Monday. I've pushed through before and as a result, had to have orthopedic surgery. So maybe I'm being paranoid, but still.