April fools, I guess? Oxygen is essential for exercise, so either you’re retarded or I missed the joke. If serious, I want a link to a source.

Ok, I found a source. Sorry for bitching at you, and thanks for teaching me something new. Cool to know. [Sauce for those interested](https://www.optimusmedica.com/intermittent-hypoxic-training-iht/#:~:text=IHT%20Benefits%201%20Inflammation.%20One%20study%20of%2017,impact%20on%20human%20health%20in%20many%20other%20studies.)