Happier with Gretchen Rubin is a conversational, sibling-hosted show that has run for over a decade (past its 11th anniversary) without missing a weekly episode. The core format is a two-person panel between Gretchen Rubin, author of The Happiness Project and Secrets of Adulthood, and her sister Elizabeth Craft, a Los Angeles-based TV writer who serves as both co-host and self-described 'guinea pig' for Gretchen's habit experiments. Regular segments include check-ins on ongoing challenges (such as the 'Move 26' movement challenge), responses to listener email and voicemail, and revisits of Rubin's recurring frameworks, especially the Four Tendencies quiz and moderator-versus-abstainer habit typing. Recurring subject matter includes resolution-keeping, relationship connection and disconnection, family rituals and reading habits, home organization, and occasional detours into personal finance. Guest interviews appear periodically and tend to be with other habit- or advice-adjacent podcast hosts and authors, such as financial educator Haley Sachs ('Mrs. Dow Jones'), Marketplace's Reema Khrais, and professional organizer Cass Arson ('Clutterbug'). Executive producer Chuck Reed is referenced by name by the hosts fairly often. Bonus episode strands like 'More Happier' and 'Move Happier' extend the main feed with shorter or guest-driven content. The show also carries heavy sponsor integration, with some episodes' available content dominated by extended ad reads for household and lifestyle products. Listeners are typically people looking for practical, incremental self-improvement advice delivered in a casual, personal, sister-to-sister conversation rather than clinical or academic self-help. The production is unscripted-sounding and personal, drawing on the hosts' own family history, including references to their father's death and their mother's habits, as material for the advice given.