Well, here's my .02 on that subject. 15 years ago, I had back surgery due to an extreme curvature of my spine. I have two titanium rods in my back that keep me straight. This also kept me from riding coasters for about five years, much to my chagrin. Anywho, I CAN read the signs and I don't assume I know better nor do I think that nothing will happen to me. What I do is strap in, hold on, and pray that nothing will happen to me. Could I injure my back? Certainly. Will I stop riding? Not until something actually causes me pain.