Andrew Huberman· PhD
And the physiological sigh is something that we do spontaneously. But when you're feeling stressed, you can do a double inhale, [inhales deeply] [exhales] long exhale. Now, I just told you a minute ago that if you inhale more than you exhale, you're going to speed the heart rate up, which would promote more stress and activation. Now I'm telling you to do a double inhale-exhale in order to calm down. And the reason is the double inhale-exhale which is the physiological sigh takes advantage of the fact that when we do a double inhale, even if the second inhale is sneaking in just a tiny bit more air, because it's kind of hard to get to deep inhales back to back, you do big deep inhale and then another little ones sneaking it in, the little sacks in your lungs. If you only have the lungs. Your lungs are just two big bags, but you've got millions of little sacks throughout the lungs that actually make the surface area of your lungs as big as a tennis court. It's amazing if