In the book published 19 months later, Robbins credits her Gen-Z daughter, Sawyer, for inspiring Let Them Theory as well as co-writing the book (though she’s unnamed on the cover — for now).

Mel Robbins talks crushing self-doubt, her go-to skin care and more "Grab your friends, your siblings, your mom, your dad, your roommates, and do not miss this experience.

Let them ruin their shoes in the rain. “It’s their prom, not yours,” she said to Robbins. After “like the 11th time,” it finally sunk in, Robbins said, and she felt herself relax.

The self-help phenom’s new book is all about letting others do as they may. Can she follow her own advice? Tony Luong for The New York Times “The Mel Robbins Podcast” often features ...