Podcast:Who Smarted? - Educational Podcast for Kids Published On: Mon Aug 02 2021 Description: What are muscles made of? How do your muscles work? Do you have to injure your muscles to make them bigger & stronger? For free home activities sign-up at www.WhoSmarted.com See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.