Find out what goes on every day Inside the Muscles! Detailed illustrations, color photos, and simple text combine to make a fun and easy introduction to how muscles work. This book also includes simple activities and crafts like Terrific Tendon, Muscle Motion and a muscle memory cup game with how-to photos to further engage young learners. Aligned to Common Core Standards and correlated to state standards. Super Sandcastle is an imprint of Abdo Publishing, a division of ABDO.