@ripley maybe you could see a physical therapist to feel safe about moving. I walk and do tai chi, but avoid heavy lifting and twisting. A PT taught me safe movements to do things like lifting from the ground. I learned to turn my body without twisting. etc. Margaret Martin at melioguide.com is helpful too. She also put out a book.

@ripley You are getting great advice here in this thread. Your docs advice to do Reclast as the first thing to do is not good advice imo. With one of the anabolic bone building meds you might get important improvement in your lumbar spine. With Reclast you are mostly stopping further loss. Why settle for that? I get being afraid of physical activity. I'm very physically active but I changed some of the things I was doing and I cut out a couple of things I love but decided were too risky. You can be active it just takes some learning about what's being safe and what isn't.