Image: From cellanr –, CC BY-SA 2.0, Hyperlink
From CNBC:

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

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