Slow and deep diaphragmatic breathing is associated with the stimulation of the Vagus Nerve and triggering a parasympathetic response.
Implement the 4-7-8 breathing protocol several times throughout your day. With consistency, over time your nervous system will shift to being more parasympathetic dominant.
Protocol:
Inhale through your nose for 4 seconds, hold your breath for 7 seconds, slowly exhale through your mouth for 8 seconds. Repeat 4 times to start.
While exhaling, place your tongue in the ‘yogic position’ (i.e. the roof of your mouth, just behind your teeth where you feel a bump).
I recommend performing this any time you start to feel anxious, nervous, or stressed.