/ Melvin and Gilda Berger SCHOLASTIC INC. New York Toronto London Auckland Sydney Mexico City New Delhi Hong Kong Buenos Aires What do your muscles do? Muscles help your body move. Fun Fact Hundreds of muscles help you take one step. Muscles pull on bones to make them move. Fun Fact Muscles can get tired when you use them a lot. Muscles help you swim. Muscles help you run. Fun Fact Your heart and breathing muscles never get tired. Muscles make your heart beat. Muscles help you breathe. Muscles let you smile. Fun Fact You use more muscles to [ frown than to smile. Muscles let you frown. Fact Your stomach muscles work without you thinking about them. Muscles help you swallow. stomach Muscles push food through your body. Fun Fact Bigger muscles can pull harder and work longer. ~--. Exercise helps muscles grow bigger. Exercise helps muscles grow stronger. -:. · Exercise gives you muscle power! ISBN ~ 0-439-77371-7 111111111111111111111111 9 780439 773713

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