There's plenty of therapeutic exercises for back pain.
And some time the exercises can hurt. Before I had my surgery 13 years ago I had to go to PT
before insurance would pay for an MRI. After a few sessions of PT I woke up one morning just after labor day screaming in agony. Only then did I get an MRI followed by a meylogram (dye injected into the spinal cord) that showed that no dye got past one spot between L3 and L5. This is called stenosis. Surgeon told me that this was the source of all my back aches since I was a teenager and that no amount of PT was going to help. Two years after the surgery I was pain free. Recently my sciatica has come back, somewhat randomly. I'll have it for 2-3 weeks and then it will go away for 2-3 weeks.
With stenosis standing hurts. With a disk problem sitting hurts. YMMV. If you lean over the shopping cart because it eases the pain, you could have stenosis, which is a result of combination of a congenitally narrow spinal canal and build-up that further narrows the canal.
So, PT helps in stabilizing the area around the injury by strengthening the muscles as well as some stretching. I would want to avoid surgery as much as possible with PT, cortisone shots, and pain medicine. When it gets too bad, then you look at surgery.
It sucks to get old.