To activate the sympathetic nervous system: narrow your vision. Go into “Portrait Mode” and let everything else fall into the background. To activate the parasympathetic nervous system: widen your visual field. See as much of your environment as you can.

I close my eyes and inhale deeply. Hold for ten seconds. I breathe out. Hold for ten seconds. This is a sequence I repeat whenever I start to feel anxious or tense - emotions I experience much too often for my liking these days.