'Even if you've never picked up a weight, Stronger is for you' - Arnold Schwarzenegger No matter how you think of yourself - strong or weak, large or small - you are substantially made of muscle. To the last day of your life, your ability to stand and go where you want to go, your agency and effectiveness in the world, will depend on it. But what is muscle? From the battlefields of Homer's Iliad, where muscles first entered world literature, to the Victorian-era gymnasiums where women built strength and muscle by lifting heavy weights, to a retirement home in Boston, where a young doctor...