The physiological sigh

Today I learned about the physiological sigh:

The “physiological sigh” is an example of a bottom-up stress management technique that can be used acutely to reduce stress or anxiety.

To practice the physiological sigh, receive an inhale, but before you get to the top, take another inhale. Then, expel all your air with a [long, slow] exhale. That’s it! A double inhale followed by a long exhale. That’s a physiological sigh.

Source

Here’s some more info from Huberman if you’re curious: