The five-time founder and author of Happier and The Awesome Human Project is known both for her public speaking and her research into what truly makes us happy. But when she was building her last company, she herself was anything but happy. Instead, she was prioritizing everything and everyone aside from herself–and that led to her spiraling into a really dark place. She spoke to host Christine Lagorio-Chafkin about how she learned to rebuild her emotional health–and what other founders can learn about emotional fitness being a key to keeping their company healthy, too.