Arianna Huffington swears by one boundary to switch off from work every night—and Ralph Lauren’s CHRO says it’s the best thing she’s ever done too

Huffington Post founder Arianna Huffington built her media empire off the back of 18-hour work days. At one point, collapsing from sheer exhaustion. But even now that she’s a multimillionaire, 75 years old, and running a wellness startup, she still insists there’s no such thing as balance—and there’s only one boundary she sticks to.

“I don’t like the word balance, because there is no balance,” Huffington tells Fortune. “There are days when work dominates everything, days when you may have a sick child or something happening at home that becomes a priority for me.”

While most people her age are retired, kicking up their feet on the beach and enjoying the fruits of their labour, Huffington is still grinding. After selling Huffington Post to AOL for $315 million in 2011, she’s now on her second act: running her next venture, her wellness startup Thrive Global. And it means long days, no real clock off time, and a never-ending to-do list.

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