Depending on exactly what one's doing, it's easily conceivable that the exposure can be concurrent with the activity. Maybe not football, where lugging around a compressed gas tank on the field is likely impractical if not dangerous, but a sport like Formula 1 or many E-sports would likely be quite conducive for an individual, and other sports like wrestling or swimming could probably be done entirely in a room with a modified atmosphere.

I've always wondered if fighter pilots ever had a system to pump different gases into their masks whenever they encounter a high-stakes situation.

Here comes the juice!

Copeng - even the inyalowda scientists can't think properly on their own planet, sa sa ke?