I do not understand the allure of a sport, for folks our age, that has as a significant component the thrill of falling down and landing hard. Sky diving involves falling, but the landing is soft. Not many folks our age play football. Softball involves less falling than baseball. Mountain biking, on the other hand, involves lots of falling, or at least the constant threat (or thrill) of falling. The upside is great landscape and no cars, but the downside of cracked collarbones and fractured wrists seems distinctly uninviting. So here in FL, where "mountain" biking is more like "sand hill' biking, I think I'll stick to the road, thank you very much.