I had a slipped disk a number of years ago, went to PT and did the usual PT exercises. It got better but never great. Over the next few years, at times, I would always get the feeling that it was about to go out. Finally I trusted in someone who convinced me that my back was fine, it was just weak. I began to deadlift and squat. At first with lightweights then progressively heavier ones concentrating on good form. I have now in about 6 months doubled both lifts in weight and have not had any more twinges that feel like my back will give out at any moment. The first couple of times that I deadlifted, I was nervous and my back did not feel great but after 3-5 workouts it felt better and better. Just another perspective.