Marcus and Dev break down Shaffer, McCraty and Zerr's 2014 review 'A Healthy Heart Is Not a Metronome' — why heart rate variability means a healthy, adaptable heart — plus a 2-minute morning breathing practice.
Read the paper: A Healthy Heart Is Not a Metronome (Shaffer, McCraty & Zerr, 2014, Frontiers in Psychology) — https://doi.org/10.3389/fpsyg.2014.01040