The gym I go to has “recovery center” with sauna, cold plunge…plus like 10 other things for recovery.
This one is an “EWOT” (Exercise With Oxygen Therapy).
The big bag is filled with pure oxygen and you suck it in through a hose while huffing and puffing on a bike:
You have to wear this mask so you inhale only pure oxygen.
I've done it twice...I'm not sure if this stuff works or if it's just interesting and fun to try.
This other "treatment" I recently tried is a bed and chair with electric nodes that shock you and make your muscles twitch.
I've done it twice and I think I'm gonna stop, it just scares me.
I used my AirPods/iPhone while on it and they both started glitching from the electric currents 😳
Like I said....I have no idea if any of these things actually help a ton, but they are fun to try!