There is not only one “good way” to breathe, there are different situations in life and different ways to most efficiently breathe through them (whether we are resting, running for our lives, playing the flute…). Below is a good article describing how a “paradoxical” breathing pattern affects body functions, and is notoriously involved in chronic anxiety / panic attacks. From there we see how to (help) operate a switch from anxious states to a relaxed state, and generally restore balance between the systems/functions, using guided deep abdominal breathing and massage of the accessory respiratory muscles. KEY.
>> A Bridge to reducing chronic anxiety and panic attacks, by Dale G. Alexander in Massage Today
More resources to Hack Anxiety on HWC’s wiki here