Thanks for caring, Chic.
I had a physical therapist and worked really hard at it, and then I exercised at home except when I couldn't.
For the past 5 years I've stuck to an exercise routine. It isn't entirely gentle but it isn't very long, 45 minutes to an hour and I take a day off when I feel I should. I can tell when it'll do more harm than good.
Added: My main injuries were spinal fractures, broken ribs, and lacerated liver. Ribs healed just fine, liver healed but there's scar tissue in it now and that's causing problems but not serious ones. The surgeon who did my first back surgery discovered a congenital spinal defect, a mild form of spina-bifida. That was repaired during my second surgery and doesn't give me any trouble.
After 3 major surgeries I did well for the most-part. Fairly recently, one of my vertebrea slipped down a little ways in front of the one below it, probably from carrying Paxton around (my foster son until he was almost 3). It's stressing my spinal cord as well as a nerve root, so I'm considering another surgery.