Are you seeing a physiotherapist (physical therapist)? If you're having epidural therapy, you should be having some physio as well (at least that's how it's done here in the UK) and they should be able to give you some ideas as to how to exercise safely.
Is a swimming pool and water walking out of the question? If you have back pain and its active, you need to be as careful as you can, but not avoid exercise. I think it would be be wise to get advice from whatever medical specialist you are under.
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