Below is a guidelines for a simple yet powerful exercise, if you give it a chance. The simultaneous placing of hands on – and thus connecting of- important centers (brain, heart, stomach..) can have an effect on the nervous system and help balance emotions on a daily basis. Importantly, it can open a “path back home” to a calm composed state in case of a crisis/panic. Like all exercises designed to help in times of emergency, it is best to practice in relatively more peaceful times, so as to be familiar with it.
Note you can also use these placing of hands to help soothe a friend, if they are OK with your touch in that moment.
source: The Art of Healing Trauma, Heidi Hanson, citing Peter Levine.