Each year on the Happier with Gretchen Rubin podcast, Gretchen Rubin and her sister, Elizabeth Craft, have done a yearly challenge with listeners—last year’s was Write 24 in ’24—as a fun and manageable way to boost happiness and build habits. In 2025, Gretchen and Elizabeth are bringing back an audience favorite: Read 25 in ’25. Each day in 2025, read for at least 25 minutes.