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.”