Conversations about wellness and our bodies usually don’t focus on what makes all movement possible – our muscles. But these parts of us are more complex than we give them credit for and tied to our overall health in nuanced ways. How we think about strength and muscle also differs based on our gender, upbringing and experience of society. In her latest book, “On Muscle: The Stuff That Moves Us and Why It Matters,” journalist Bonnie Tsui explores how muscles really work, and what doctors and scientists are learning about the importance of strength training and muscle health. In this program from Aspen Ideas Health, Tsui explains to CNN medical journalist Elizabeth Cohen how her curiosity about muscles led her into deep research, anatomy lab visits and reflection on culture, herself and her family.