Gretchen Rubin, 'The Four Tendencies'

In her new book, "The Four Tendencies," best-selling author and speaker Gretchen Rubin breaks down what she denotes as four different personality profiles -- Upholder, Questioner, Obligor and Rebel. Rubin, who is also the host of the popular podcast, "Happier with Gretchen Rubin," and calls herself an "Upholder," says "The Four Tendencies" help explain …