Sharing my experience with back pain in the hope that it might benefit some one. I am a programmer and I used to work 11 hour days frequently. After some years

Sharing my experience with back pain in the hope that it might benefit some one. I am a programmer and I used to work 11 hour days frequently. After some years I started experiencing excruciating lower back pain. The pain would flare up if sit for more than 30 minutes. I went for physiotherapy and the pain lessened. The therapist told me I had no core strength and I started taking yoga lessons. Yoga felt good and I continued for 3 months, when things got worse. I consulted a specialist and he advised against yoga and all sorts of exercise. I haven't done any exercise in the past 6 months . And I have no pain in my back if I sit for 8 hours. Sit longer, and mild pain appears. The point I want to stress is when doing exercise and yoga, I felt good and pain lessened, but the mild pain was there at all times when I was sitting. Now with no exercise , I can sit pain free for 8 hours easily.Consequently ,I am much more productive at work , but the lack of exercise makes me sometimes feel dull and unhealthy :( .