Physiological sigh
A breathing technique involving two inhales followed by a long exhale, used to calm the nervous system by slowing heart rate and reducing carbon dioxide.
Videos Mentioning Physiological sigh

How to Optimize Female Hormone Health for Vitality & Longevity | Dr. Sara Gottfried
Andrew Huberman
A breathwork technique involving a double inhale through the nose followed by a complete exhale to empty the lungs, shown to improve mood and lower resting heart rate in minimal effective dose studies.

AMA #3: Adaptogens, Fasting & Fertility, Bluetooth/EMF Risks, Cognitive Load Limits & More
Andrew Huberman
A rapid stress-buffering technique involving a specific double inhale and long exhale sequence, effective for immediate calming.

Fitness Toolkit: Protocol & Tools to Optimize Physical Health
Andrew Huberman
A breathing technique involving two inhales through the nose back-to-back, followed by a long, full exhale through the mouth, used to rapidly calm the nervous system and aid recovery between sets.

How to Improve Skin Health & Appearance
Andrew Huberman
A real-time tool for stress reduction, involving two inhales through the nose followed by a long exhale through the mouth; studied at Stanford for its effectiveness.

Improving Health With Stronger Brain-Body Connection | Huberman Lab Essentials
Andrew Huberman
A breathing technique involving two inhales followed by a long exhale, used to calm the nervous system by slowing heart rate and reducing carbon dioxide.