The thread I read before this one was titled "Being told what to do." Co-incidence? I think not.
I don't workout at all and never have done. I wasn't keen on games and PT at school, but I did both (reasonably well) because they were in the timetable. After leaving school, my only exercise was dancing (quicksteps, foxtrots, jives, waltzes, in smoky dance halls) and speed walking from Waverley to Chambers Street to reach my seat before a lecturer started speaking. I never again went near a games pitch or a gym, except for a short period in my fifties when I accompanied a friend to a "women only morning" once a week at the gym, followed by a game of badminton or squash (her idea, and she always won)
My future husband sometimes went rock-climbing, but I never joined him. We went on some very pleasant long walks together, taking our children with us once they arrived, but the object of the walks was to see the countryside/scenery/ landmarks, not to "get fit". When he died after nearly fifty years of marriage, I kept up the walks, but they have gradually got shorter.
I am now over 80, and my body is getting less efficient in various ways, but I reckon I am at least as healthy as many people I know who have gone to a lot of trouble through their lives to keep fit. What they have achieved by all the workouts is to get strong in all the muscles that they have exercised. Their body health is no more than mine if you add up all the muscles and organs that make up their bodies.