THE CLEVER ART OF OUTSMARTING THE DEMON
“As a practical matter, this means that the minute you start to ruminate and slip into brooding negativity, look elsewhere. Do anything. Walk around. Yell. Dance a jig. Dice celery. Play the piano. Feed your dog. Sing “Row, Row, Row Your Boat” while standing on one leg. Tie your shoes. ... Or try an exercise that zeroes in on your breathing. Pick a pattern to focus on, for example, 6-3-8-3. Inhale for six beats, hold for three, exhale for eight beats, hold for three; repeat. After a few cycles, you will move out of the DMN.”
Quote from chapter 2 of ADHD 2.0 - New Science and Essential Strategies for Thriving with Distraction--from Childhood through Adulthood by Edward M. Hallowell, M.D. and John J. Ratey, M.D.