A couple of times, to manage and maintain a healthy skellington.
My back got sorted out, then I stopped when everything felt good.
There's a point where it's unhealthy to keep having your back moulded and cracked into place - as I reckon it eventually trains your bones to have the movement to go out of position easier.
Swimming is very good for the skeletal-muscular relationship, and a bit of exercise at the gym.
Too much pumping iron, running and jogging are in my opinion, ultimately negative for the body.
Every avid jogger and runner I know has had problems with knees, leg muscles, bones or veins.
Or ankles.Those taking up running get healthier initially, but eventually the force of 4G's on vertebrae, knees & ankles, cannot be sustained.
Ultimately I think you are right and I would add, each individual has his or her sustainable limit of regular impact on the skeleton.