I have to admit, as much effort as i put into good technique and
safety, about 2-3 times a year i take a good fall (while riding about 6-12 miles an hour), and sometimes i land on a rocky surface. I wear an expensive top of the line full face helmet, goggles or sunglasses and lots of padding in all of the crucial places people tend to land (shoulders, elbows, hips, knees, hands, shins), but still there is a moment of impact.