High-altitude training mask

There's a WHOLE lot more to climbing (or doing anything at altitude) at altitude than just being harder to breath due to less O2 available and in your lungs. Buff hit on a few of them. The partial pressures in all your tissues, (whole body, not just lungs) are affected due to the elevation. I suppose these masks might possibly have some positive side effects, but they don't do anything systemically to prepare you for altitude work.
The fight training actually makes a bit of sense. Getting blasted in the nose takes away much of that breathing path. Then you have a mouth guard taking up much of that space. Then, you have your teeth closed around that mouth guard so your jaw doesn't get broken the next time it gets hit... Not much flow path. That's where Wanderlei's trainers came up with the snorkel and tape idea.

I would imagine the Bas Rutten thing or the snorkel and tape would work for a fighter because it still makes them keep their jaw clenched...

Anyway, this is a climbing forum, sorry for the derail.
I think the mask is ridiculous for climbers training for altitude.

A choking mask, hmmm?

I'm a porn star, btw, for those that asked