Thanks everyone for your ideas and suggestions. I agree with y'all that the PT should be involved in working out a plan. I also wasn't sure about rebounding, even though it would be low impact. Also, we all have different bodies, as we can even see in this thread (and my experiences included.)
Yogapam, InParis: Good to know that the bungee style would work better. Also, thanks for the input on the Jumpsport. I'll pass it on. Also, I don't know about my sister's MIL, but I might be getting one soon.
Mamma1st, Cheryl and Rosepetals: Thanks for sharing your positive experiences with rebounding (and suggestions about products.) I will pass it on.
Seww, HorseMom and Donna D: Those are great ideas too. I was thinking about suggesting T-Tapp More Chair, but thought they might be put off by the price point, and well the T-Tapp of it all
(Or she might be into it...who knows?
.) All of those suggestions would be more accessible. And I don't know why I didn't think of sitting on a ball.
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I guess what I'm actually looking for is something that she can do that will give 20 minutes of steady-state cardio. The purpose is for mental health benefits. She was recently diagnosed with depression but isn't willing to get on medication or pursue mental health options, which is why I suggested this. I'm also recommending she do an MBSR program, because I think it will address the pain as well as the depression. She has been going through this for years, and it sounds like the PT hasn't made any suggestion along these lines, so I'm hoping to give her some ideas to bring to the PT to move along the possibility (if they approve.)
Sounds like rebounding might or might not be an option, cycling might or might not be an option.
Does anyone have any thoughts about elliptical? Or any other ideas to pass on?