I had problems strengthening while lying down (triceps, middle and lower traps) which ultimately led to me stopping PT. I would get burning pain in the shoulder regions and dizzy spells when I stood up. Same burning when I did the standing, corner, chest stretch. Initially I thought I was just waking up weak, tight muscles but eventually learned it was irritated nerves. I think the dizzy spells were due to poor circulation while doing the exercises. I still get dizzy at times and have constant headaches that I believe are due to the vascular TOS.

I believe I was only using 3lb weights on triceps and no weight at all for the other exercises laying down.