That's not really a relevant question, actually. We know definitively that active is strictly better than inactive in all respects unless someone has such seve

That's not really a relevant question, actually. We know definitively that active is strictly better than inactive in all respects unless someone has such severe end stage cardiorespiratory issues that they risk actual death, or some other unusual condition that makes exercise contraindicated, in which case, of course, speak to a doctor and obey their advice. Even if it merely preserves function (which I would be skeptical about, humans are amazingly adaptive), the alternative is inactivity and thus gradual loss of function indefinitely over time until death.