I had a similar experience when I was taking Aikido classes, dropped my motorcycle, (high-sided over the tank/bars) and instinctively tucked my head and rolled.

I had a similar experience when I was taking Aikido classes, dropped my motorcycle, (high-sided over the tank/bars) and instinctively tucked my head and rolled. I had a backpack on with schoolbooks in it and rolled back up to my feet, suffering nothing more than some mild bruises.