When we are stressed, we take shallow breaths. And let's face it, we all get stressed at some point during the course of our day. Some of us for longer periods than others. So train your brain to take long, deep, slow breaths through your nose and exhale slowly thru your nose, while keeping your mouth closed, for as long as possible. Doing this for 3 breaths every two hours will improve your brain function and make you feel calmer :)!