Breath: The New Science of a Lost Art

by James Nestor

peak efficiency: A good, doctor-reviewed overview of this type of paced “coherent” breathing: Arlin Cuncic, “An Overview of Coherent Breathing,” VeryWellMind, June 25, 2019, https://www.verywellmind.com/an-overview-of-coherent-breathing-4178943.