I'd been working out at the gym for the past several months doing upper/lower body workouts 2x/week, in addition to cycling and other cardio work. I had 12 sessions with a trainer who is a retired PT. I might have done too much, too soon, but nothing hurt and I was feeling great, getting stronger, seeing the muscles shaping up. The rotator cuff is not a muscle group to reckon with, and I want this to heal.
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I have a rotator cuff tear. I don't know whether they can rule out a tear without a specialized type of ultrasound, but the treatment might be the same as for tendinitis. Anyway, I got the tear a year ago from lifting my suitcase into the overhead bin on a train. It was not a particularly heavy suitcase and I would think my upper body strength was perhaps the best it has ever been because I was going to the gym and had a personal trainer. I was told it was a partial tear but significant, though not enough to warrant surgery. I am free of pain and have almost complete freedom of movement because of the physiotherapy I have been doing. I will have this tear for the rest of my life.
I am told to not do any heavy work over my head. I also no longer do any weight training that requires me to push up with my arms. So much for being in the best upper-body strength of my life.