Jack Dorsey — Ice Bath and Walking Commute

Jack Dorsey starts with a five-minute ice bath at 35°F, a method that boosts norepinephrine levels by 250%, then follows with a five-mile walk to the office, covering 10,000 steps in under an hour. His routine is data-driven, with measurable benefits like lowered inflammation biomarkers and a sharpened ability to make high-stakes decisions.