Don't disagree with you there, I would expect that too. I haven't paid attention to if HS/college track athletes are overepresented, but I'll start now that you mention it.

Quick look at the NYC marathon had 33k entrants this year vs 50k in 2019. There could be something there with your everyday runner experiencing issues and not training for it, but it also could just be less people wanting to travel post scamdemic so that doesn't tell me much.

I would also guess that with sports/fitness that aren't really in a structured league there would be less of the forced vax. If you're a weight lifter for instance a compeition may want a negative test day of, so Id guess you have a lesser percentage vaxxed outside of major sports.