What To Do For Herniated Discs?

I have L1 and L2 Herniated discs, what do you recoment as an every day workout? I just walk. Please let me know which doctor can help me, I have been with Neuroscience, therapies cold and hot, but only the Quiropractitioner helped a little bit. I am 53 years old and very active person. I want to strenght my back and no surgery.

Thank you