The Power of Hot and Cold: Sauna, Ice and Longevity

Finnish researchers tracked 2,300 men for twenty years and found that sauna use 4-7 times weekly cut sudden cardiac death risk by 63 percent. The mechanism is hormesis: controlled heat stress forces your heart rate to 100-150 bpm, dilates blood vessels, and shifts cells into repair mode — passive cardio without movement. Cold immersion releases norepinephrine and dopamine, delivering real alertness, but its longevity evidence remains thin compared to heat's two-decade data. This book separates solid science from ice-bath hype.

You'll learn:

- Why sauna mimics moderate exercise while you sit still

- The hormesis principle behind controlled stress adaptation

- Which thermal practice has decades of evidence versus months