3 minute breathing excercise, reduces stress & anxiety; regulates the parasympathetic system

https://www.psychologytoday.com/ca/blog/conquer-fear-flying/202004/what-brain-system-fights-anxiety

https://www.psychologytoday.com/ca/blog/the-athletes-way/202004/parental-hugs-calm-infants-and-parents-nervous-systems

https://www.psychologytoday.com/ca/blog/mind-games/201812/wired-connect-our-nervous-system-notices-harm-first