Any exercise suggestions for severe back spasms and nerve damage?

I'm going through my pre-op insurance nightmare. My only roadblock is the exercise requirement. I have constant & severe back spasms along with nerve damage to the abdominal area on my right side that produces an extreme burning sensation. I find it hard to exercise when the two areas are acting up. It's to the point of not being able to walk. I'm getting discouraged through this whole process because my insurance will not accept a waiver from my pcp & orthopedic doctor. Any suggestions on what I can try to meet this requirement?

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