Box breathing is a technique used to induce a sense of zen in the most stressed of individuals. It's not actually breathing through a box, but rather, breathing through a mental box.
Here's how it works:
Sounds simple, right? But don't be fooled, my friend, it's not that easy. It takes practice, focus, and a healthy dose of desperation.
Want to learn more advanced breathing techniques? Check out:
4-7-8: The Breath of a Thousand Faces Kapalabhati: The Breath of a Thousand Chakras