Dr. Andrew Huberman

That's the box.

Inhale, hold, exhale, hold, inhale, hold, exhale, hold of varying durations, depending on your so-called carbon dioxide tolerance.

But at the end of the day,

you're maintaining kind of even heart rate.

When you do big cyclic hyperventilation, aka Wim Hof Tumo breathing, you're increasing heart rate and autonomic arousal, release of adrenaline.

Do cyclic sighing, a lot of exhales.

The opposite is true.

Okay, so that should give you a framework for thinking about

breathing and how to apply different breathing techniques and get us away from some of the naming of things.

But I'm not trying to take anything away from so-called Wim Hof breathing.

By the way, if you're going to do Wim Hof breathing, be very, very careful to not do cyclic hyperventilation or Wim Hof breathing and then

do breath holds and don't do that anywhere near water.

There have been cases of people drowning, dying from combining cyclic hyperventilation and breath holds with water because it changes the threshold for shallow water block out.

When you exhale a lot or when you hyperventilate,

You remove a lot of carbon dioxide, and carbon dioxide is the stimulus to gasp.

So what will happen is, indeed, if you do... You're blowing off a lot of carbon dioxide, and then you go... Right, that's a whim exhale.

And then you hold, and you go underwater.

Yeah, you'll hold your breath longer than you normally would, but instead of feeling that impulse to breathe, like that gasp reflex, and you shoot for the surface, you'll just...

done.

So it's a serious thing.