Box breathing – quick calming method

I’m finding myself doing a lot of box/square breathing lately. It’s simple to learn, calms you down quickly and you can do it anywhere. I normally sit on the floor but that because I’m comfortable there. You could be sat at a desk, stood up, whatever works for you.
Close your eyes. Breathe in through your nose while counting to four slowly. Focus on the air entering your lungs.
Hold your breath while counting slowly to four. Try not to clamp your mouth or nose shut. Simply avoid inhaling or exhaling for 4 seconds.
Begin to slowly exhale for 4 seconds.
Repeat steps 1 to 3 at least three times. Ideally, repeat the three steps for 4 minutes, or until calm returns.
Breathe for 4 – Hold – count for 4 – exhale for 4 – Hold – Inhale for 4