I read that the O likes to work out in the gym.
He does ride bikes, but I think he rides them sort of casually more as recreation.
I doubt he does much actual mountain biking....though he might very well 'ride' a mountain bike for fun for all I know.
I'd guess that 'most' people who own/ride mtn bikes don't actually go mtn biking. I see mtn bikes all over the places here in my town....it's what macho younger guys, kids, and many people with less available money tend to buy if they are buying new. They also want those heavy suspension forks for when they drop off the curb on the way to the corner to buy a pack of cigarettes. (hey, maybe that's what O uses his bike for too?)