When I stopped exercising and working out, I remember this one time at work reaching for a pen that had fallen on the floor and had this intense pain in my shoulder/shoulder blade area that I'd never felt before. It was truly embarrassing how badly I had let my body go
I have a bulging disc in my lower back
I had a torn labrum in my right shoulder. I had surgery to fix it, but I need to keep exercising because even with the surgery, the muscle has to do more stabilizing than before. I learned that the hard way when I stopped and it started dislocating again
I suspect I may be developing arthritis in my left knee.