The Way of the Iceman: How the Wim Hof Method Creates Radiant Long-term Health—Using the Science and Secrets of Breath Control, Cold-Training and Commitment

by Wim Hof

David Servan-Schreiber writes extensively on the importance of good heart rate variability. He claims that people suffering from depression, stress, cancer, or who are in the final stages of life have low heart rate variability without exception.