Also, and quite interestingly, xenon isn't the only element that does this. Cobalt does something very similar: https://pmc.ncbi.nlm.nih.gov/articles/PMC6157393/
Athletic use is probably more common than people think. And I'd be absolutely shocked if Xe gas weren't already being used in racehorses. (You wouldn't believe the state of chemical warfare in that sport.)
There's also potential military use -- especially in combat divers. They're very limited by the amount of breathing gas they can carry. Anything to meaningfully cut oxygen use could be a game changer.