For years, I rode horses. Once in a gallop, my body shifted and to the passerby I probably looked like I was doing some fancy trick.
I didn't fall off, but every muscle in my body ached for days.
I develped a herniated disc and this malady got worse over the years. I try to convince myself that it was due to other means, but I'm pretty sure it was due to riding. Riding horses was my greatest pleasure...I miss it so much.