I think you mentioned the main ones, awareness of breathing rate / depth and relaxing your abdominal muscles / diaphragm to breathe deeply. Interesting side note - the innervation for the diaphragm comes from the neck, so if you are aware of sensation of it, it's experienced in the shoulder region.
Breathing depth and rate is so closely linked to physiological stress. Breathing exercises are such a simple intervention to break this cycle but they do work surprisingly well.
Breathing depth and rate is so closely linked to physiological stress. Breathing exercises are such a simple intervention to break this cycle but they do work surprisingly well.