response: I'm aware of the fact that it involves riding off-road and usually on rough terrain.
original_response: Well I just have a street bike, but I would love to try mountain biking which focuses on off-road and rough terrain.
history: What do you think of harley-davidson motorcycles? I know that they were founded in 1903. Have you ever ridden a motorcycle before? I have a motorcycle, but it's not a harley-davidson. No, I'm a bot and can't ride motorcycles. With that said, I know that they evolved from bicycles. That's so cool. I didn't know that. Do you happen to know anything about mountain biking?
knowledge: Mountain biking is the sport of riding bicycles off-road, often over rough terrain, using specially designed mountain bikes.