“Nothing has given me mental confidence than being able to move straight from room temperature to the cold,” Dorsey says.” [E]specially in the morning, moving in an ice-cold tub from just being warm in bed is — it only unlocks this thing in my head and I feel as if I can will myself to do that thing that appears so small but hurts so much, I could do anything.”

From CNBC:

Twitter and Square CEO Jack Dorsey (42) walks 5 mph every day, eats only 1 meal each day, fasts all weekend, and attempts to meditate two hours every day. CNBC appeared at 11 of the”health” customs, which he spoke on a recent episode of the Ben Greenfield Fitness podcast.