Muscles make you move, by pulling your bones about. When you smile or cry, speak or eat, walk or skip, muscles are doing the work.
[Your biggest muscles are the ones you sits on!]
[A muscle can only make itself shorter. It needs another muscle pulling the other way to stretch it out again.]
[To make a bone move, a muscle gets shorter. This pulls the bone one way. To pull the bone back again, another muscle gets shorter. Muscles are fixed to your bones by strong white strings called tendons.]
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