How Do Your Muscles Work? is a fantastic introduction to the science behind how your body moves and what holds it together. The skeleton muscles and skin are explained through hilarious colorful illustrations and an engaging question and answer format designed to appeal to even the most reluctant readers. Packed with plenty of giggle-worthy gross bits it's a fun and accessible look at an important subject.
Buy The Curious Kid's Guide To The Human Body: How Do Your Mighty Muscles Move? by John Farndon from Australia's Online Independent Bookstore, BooksDirect.