What makes muscles grow?

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Jeffrey Siegel |

TED-Ed

• November 2015

We have over 600 muscles in our bodies that help bind us together, hold us up, and help us move. Your muscles also need your constant attention, because the way you treat them on a daily basis determines whether they will wither or grow. Jeffrey Siegel illustrates how a good mix of sleep, nutrition and exercise keep your muscles as big and strong as possible. [Directed by Brett Underhill, narrated by Addison Anderson].