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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.
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Fun Fact
You use more muscles to