9781422286999

E xercise and the B ody Chapter One

P eople exercise for all sorts of reasons. They exercise because they think it’s fun. They exercise because they want to look a cer- tain way. Some people exercise because they like to compete. Others exercise because they like the emotional rush it gives them. But whatever our motivation for moving our bodies, exercise changes us. It not only changes the way we look on the outside, but it also changes the way our internal organs function. It changes the way our hearts and lungs, kidneys and intestines work. It even changes the way our very cells do their jobs. Our bodies are built to move. They’re designed to meet challenges. The more we exercise, the stronger we become. If we haven’t been

9