Through the six chapters, young Spanish readers will learn how the body moves, how muscles function, which muscles require our movement, muscles that work without our assistance, the heart, and how to maintain a healthy muscular system. The text is interactive and engaging for young readers. The informative book is highly recommended for learning about and discovering the body's muscular system. Educators and children will find it to be a comprehensive overview of the human muscular system. Before beginning the first chapter, the author presents the vocabulary words and asks readers to use context clues throughout the reading to determine the definitions. The glossary words are also included at the end of the book for readers who may have difficulty or who need to make reference to the definition of the terms. In addition, the photographs and visual representations will assist readers in understanding the functions of the muscular system. The book also includes reading suggestions for adults or educators, additional books on the subject, Web sites, and an index.