They post signs before boarding and an important one is if you have low back problems, you shouldn't ride. My uncle rode it for the first time last Sunday and it reminded him of back home in South Dakota when he'd go hunting in his Jeep. The back roads were awful and he said you had to hang on for dear life when, in those days, they didn't have seat belts! He needs to be careful with his back, but he really loved it! So, then, you get those who'll take the pain just to have fun!