From CNBC:

“Nothing has given me more mental confidence than Having the Ability to move direct from room temperature into the cold,” Dorsey says.” [E]specially in the morning, moving into an ice-cold tub from only being hot in bed is it just unlocks this thing in my mind and I feel as if I can will myself to do that thing that appears so modest but hurts so much, I can do anything.”

Twitter and Square CEO Jack Dorsey (42) walks 5 miles to work daily, eats just 1 meal each day, fasts all weekend, and attempts to meditate two hours a day. CNBC looked at 11 of his”health” customs, which he discussed on a recent episode of the Ben Greenfield Fitness podcast.