Longtime swimmer here and I developed some pretty gnarly impingement in left shoulder and tendonitis in right shoulder prohibiting me from swimming in 2020 after a few years of masters swimming competitions. I went to ortho and got MRI to confirm no tears, cortisone shot made it worse, and PT over a few months doing the resistance band exercises started helping a lot, but the only thing that finally cured it was the hanging method described by Dr. Kirsch orthopedic surgeon who discovered this method to heal his own shoulder and avoid surgery himself. I read the book and ordered some deadlifting wrist straps from amazon and began hanging a few mins a day from my pull-up bar and within weeks I was cured, and to this day anytime I feel a twinge, its back to a few mins of hanging with the straps, although I recommend allowing some weight to be supported with your feet, especially when first starting the regiment. Dr. Kirsch shows x-ray evidence in his book of how the shoulder joint can be permanently enlarged with this regiment allowing more room for rotator cuff tendons to move freely and that is how the problems are cured. Honestly, I would not be still swimming and improving to this day without the hanging regiment and of course I still do resistance band exercises to strengthen the shoulder tendons. Here’s the book:
Shoulder Pain? The Solution & Prevention, Revised & Expanded: Kirsch M D, John M: 9781589096424: Amazon.com: Books
Amazon.com: DMoose Weight Lifting Hooks (Pair), Hand Grip Support Wrist Straps for Men and Women, 8 mm Thick Padded Neoprene, Deadlift, Powerlifting, Pull up bar, Liftups, Shrugs : Sports & Outdoors