1. What Bro. Buzz said
2. None of us can provide (intelligent) advice without reviewing (intelligently) your MRI. Really.
3. Rotator cuff injuries are almost always (in us old guys) associated with other shoulder pathology.
4. If an old guy collapses on the street and has a tattoo "Do Not Resuscitate" on his chest, and no scars as evidence of previous surgery, he is likely a retired doc. Really.
5. Exercises help both heal and prevent injury, but need to be directed based on YOUR MRI, by a therapist with experience in YOUR problem.
My R shoulder is a mess, but swimming regularly helps a great deal, and helps my other mess body parts unless I overdo
https://www.webmd.com/a-to-z-guides/rotator-cuff-home-rehabilitation-exercises 
