I have cervical spodolosis and fused and degenerating lumbar discs with sciatica. any advice to stop progression of degenerating discs?

Exercise: It is hard to stop degeneration but you can take some steps to limit your risk factors for rapid degeneration. Maintain ideal body weight, do not smoke and work on core strengthening so your muscles support your spine better.

Disc degeneration: Disc degeneration is essentially an age associated process, with genetics playing a role as well. Unfortunately, science has not figured out how to stop or reverse aging, although research is certainly being done in this area. Your best bet is to work on your overall health, including core strengthening and conditioning, maintaining a good weight and diet, and exercising regularly.

Core Exercises: Typically core strengthening exercises are the best to help relieve pressure and forces in the spine. I would try and google some or look them up on youtube to see descriptions. If you can do them yourself, wonderful otherwise ask your doctor to get a referral to a good physical therapist for further assistance.