My spine is a mess. GYROTONIC® training has been great for it, not harmful.
I was in a pretty serious car accident back in 1985. I was driving to school on a 2 lane street. My car experienced a mechanical failure and the front end collapsed onto the ground. That created a pivot point and my car turned directly into oncoming traffic. I hit one car almost directly head on, bounced off it and hit another car. My car wound up on someone's lawn. The front end of the car on the driver's side was completely smashed inward. I have no memory of the accident at all. I was driving and the next thing I know I'm being pulled out of my car by the fire department.
My head hit the upright where the windshield meets the frame and was cut severely, requiring 23 stitches in my left forehead. Both arms were badly bruised, the left from the shoulder all the way to the elbow.
I don't have any pictures of the wrecked car anymore but I did see them and I know I am very fortunate to be alive.