I think for me to believe the thesis, I'd want them to demonstrate that people who aren't rich and also enjoy endurance sports do it for different reasons than

I think for me to believe the thesis, I'd want them to demonstrate that people who aren't rich and also enjoy endurance sports do it for different reasons than rich people. Otherwise, the question is "why do people love endurance sports", and the focus on white collar workers is just a headline-grabber.