The conversation between human and AI assistant.
The top of my left shoulder pinches and cramps (very painfully) when I'm struggling on the last few reps of the barbell curl, why is that?
I have tried adjusting my form a bit, but it doesn't seem to help much. And I don't think the weight is too heavy for me.
Hmm, it's possible that you could be doing the exercise incorrectly and putting too much strain on your shoulder. I suggest consulting a personal trainer or fitness expert to assess your form and make sure you're doing the exercise safely and effectively.