Marcy and Jack take on a two thousand nine HeartMath chapter arguing positive emotions may start in the heart, not the brain — the smooth ten-second coherence wave where heart, breath, and blood pressure lock into one groove — plus a two-minute shift-the-rhythm morning practice. Read the paper: The Central Role of the Heart in Generating and Sustaining Positive Emotions (Rollin McCraty, Robert A. Rees, 2009, The Oxford Handbook of Positive Psychology) — https://www.heartmath.org/research/research-library/monographs/the-central-role-of-the-heart-in-generating-and-sustaining-positive-emotions/