Liz and Sarah have a guest co-host -- Gretchen Rubin! Liz's sister Gretchen takes a break from her The Four Tendencies book tour to weigh in on how to know if an idea is a good idea. She also offers Sarah advice on how to manage her Rebel daughter. They also debate gyms -- fancy vs. schlubby -- and share a Hollywood Hack that recently saved them a lot of money -- American Express Travel. 

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