When prehistoric humans were in danger of attack, their breathing became shallow as they prepared to run or fight. Today, we still have the same stress response. When modern tensions build, deep breathing counteracts the stress response.
Deep breathing is a great natural stress releaser anywhere, any time.
Do deep breathing for two minutes or more. To increase relaxation, imagine breathing in ocean air or the scent of flowers. Lying down in a dark room with feet up and a cool wash cloth over your eyes. Ice packs applied to the back of the neck. Do it yourself or ask someone else to deeply massage your neck, shoulders and scalp.