Jack Dorsey has emerged as a lifestyle guru in Silicon Valley, raising demand for near-infrared saunas, meditation retreats, cryotherapy spas, and fasting tools (Nellie Bowles/New York Times)

Nellie Bowles / New York Times:
Jack Dorsey has emerged as a lifestyle guru in Silicon Valley, raising demand for near-infrared saunas, meditation retreats, cryotherapy spas, and fasting tools  —  The Twitter chief executive is tech's foremost manfluencer, guiding his followers toward optimum cognitive performance.  Or, at least, hunger.