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. This cold exposure cocktail is cheaper than #5 Mark Zuckerberg's wardrobe simplification, costing nothing beyond a thermometer, yet delivers faster mental clarity: Dorsey reports a 40% increase in focus during the first hour of work. His routine is data-driven, with measurable benefits like lowered inflammation biomarkers and a sharpened ability to make high-stakes decisions.