What do you use with every move you make? Muscles! You use muscles to do a cartwheel and lift a pencil. But they also help your heart beat, help you breathe, and work to break down food in your tummy. What could be mightier than muscles? Explore what's inside you with fun text, bright pictures, and lively illustrations. Glossary of key words Index Table of contents Our bodies are super machines that keep us moving, learning, and having fun. But how do they work? The secret is inside! Explore different body systems, what they do for us, and how to keep them healthy. Each book pairs colorful illustrations and photographs with engaging text and fun facts

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