RIANNA HUFFINGTON IS a lot of things. She's bold, whip-smart, even regal. Most of all, she's prescient. She spawned her workplace well-being platform Thrive Global in 2016—years after reckoning with the kind of exhaustion perhaps only an entrepreneur could appreciate. (She'd once passed out from extreme fatigue while working 18-hour days building the Huffington Post.) The increas ingly popular view that
