It's certainly not related to hacking, but on the other hand, there's always that broad "satisfies our intellectual curiosity" banner that you have to hold things to. Although it was short and to the point, it caused me to reevaluate something I had taken for granted, so personally I think it fit the bill.
Plus, I have a suspicion that the overlap between people who work out and people who go to hacker news is larger than you might think. I know that jogging, for instance, helps me focus, and I've heard other coders say the same. But I think I'm getting a bit tangential.