People experiencing stress tend to take short, shallow breaths from the upper part of the chest rather than from the diaphragm.
Fast, shallow breathing can worsen feelings of stress and anxiety. Whereas breathing more deeply, from the diaphragm, can increase feelings of calmness and wellbeing.
You could try the following deep breathing technique for 10 minutes as part of a regular routine to help you manage stress. Or you could use it when you notice your stress levels rise.