Last year, just after first seeing the GP, I went for Physio. The guy was young, only a few years out of Uni and happily allocated more brain cells to remembering what reason I'd given 3 weeks prior for not doing the recommended excercises that week, than to remembering which shoulder was faulty. He also misdiagnosed the malady as one of the Infra, not Supra, based on the feel of the muscle which he said was "grainy". I finally saw a specialist surgeon 10 days ago who ran me through a series of excercises and suspected it was actually the Supra, and the subsequent MRI confirmed this.
Just to be clear, I haven't done ANY weight-training (apart from shopping bags!) whatsoever in the last 6 weeks, due more to pressure of work. However that's settled down, but has only moderated, not eliminated the shoulder pain. For the last couple of days, I've been stretching the shoulder by pulling the left elbow towards a point slightly above my right shoulder, and holding it there for 30 seconds or until I feel the very first hint of pain, whichever is the sooner.
My usual training split was as follows, 3 sets of 4-6 reps per movement, plate changes done as far as possible with the RIGHT arm:
Mo - Legs (Squat/DL) + leg curls/xtensions
Tu - Back (Lat pulldowns + B/o rows)
We - Upper Arms (BB curls/Tricep Pushdowns, both palms up/neutral/down)
Th - Forearms (Wrist Curls/xtensions)