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I think it really dependends on how severe the inury, where it was, what was affected and what amount of excercise you are considering.

I dont drive and transport is a bit iffy my way, so I walk between 3 and 15 miles a day depending on what I need to do. This definately delayed healing, caused symptoms to worsen.

Stagnancy would also be unhealthy. We each need to find a balance. I can just about cope with four miles a day, though I am exhausted by aftertoon.