Stress can cause us to breathe more shallowly and can lead to anxiety attacks, muscular tension, headache, and fatigue. Most people are not aware they are breathing shallowly or that they are breathing from their chest instead of deeply from their diaphragms. Deep, diaphragmatic breathing is the easiest way to produce the relaxation response.
Try lying on the floor, placing one hand on your chest and the other hand on your stomach. When you breathe in, notice whether your abdomen expands. If your belly doesn't move, or moves less than your chest, you are breathing from your chest. To learn how to change from chest to stomach breathing, exhale fully one or two times. This will create a vacuum that will pull in a deep, diaphragmatic breath. Also, you can push your stomach out as you are breathing in. Breathing deeply is a skill that you can use to help you relax wherever you are.
One last thing you can do is use a clock with a second hand to help you time your breaths. On the odd numbers, breathe out, and on the even numbers, breathe in. This will have you breathing 6 breaths per minute, which is a comfortable pace for many (but not all) people. Experiment with this to find your most comfortable breaths per minute.
