[koralatov]

I agree with you: the majority of genuinely fitness-obsessed, or even fitness-interested, people could run 10K.

I wonder if parent means the people who give the appearance of being fitness-obsessed, rather than those who genuinely are fitness-obsessed.

There is a large section of the population here in the UK who dress as if they exercise regularly, but actually do very little exercise -- these people buy Nikes and yoga pants and wear them around, but never actually engage in any real exercise. They're the ones who look at you like you're insane when you ask them which gym the use, or if they're training for a 10K run.

The local university campuses have a large number of people like this attending classes dressed as if for a workout. I see a lot of them in coffee shops, and even some in pubs.