Take a second and notice your breathing. Is it shallow? Do you tend to stop breathing as deeply when you are concentrating or stressed?
Try this: take a deep breath through your nose for a count of five, and make sure your abdomen expands. Hold it for a moment, then exhale through your mouth for a count of five.
Controlled breathing like this can make us feel less stressed and anxious. It can lower blood pressure if done on a regular basis. Deep breathing triggers the relaxation response.
Check out Harvard Health on how to get into a deep breathing routine.