AdvertisementFlattening The 'Mummy Tummy' With 1 Exercise, 10 Minutes A DayAugust 07, 2017Michaeleen DouclefffacebookEmailWomen work on strengthening their core abdominal muscles in Leah Keller's exercise class for new moms, inside a San Francisco clothing store called Monkei Miles. (Talia Herman for NPR)
