Your body is truly amazing - in this book find out what's going on inside your chest. What do your heart and lungs do? Why does your heart beat? Why do you breathe? And why does your heart thump harder when you exercise? The book is perfect for children aged 7+ who are studying science and the human body. The book is part of the series 'Your body - inside and out' in which photographs and artwork combine to show you how your body works - both inside and out!