Journalist, author and life-long athlete Bonnie Tsui is fascinated by muscle: how it looks; what it does, and how we think about it. Her curiosity led her to the meat of her new book, On Muscle: The Stuff That Moves Us and Why It Matters, which explores the world of muscle from five different perspectives: strength; form; action; flexibility, and endurance. Jen chats to Bonnie about the nature and narrative of muscle, perceptions around strength, and taking a look under the proverbial bonnet.

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