We know that exercise is good for us, but what is actually going on in our bodies as we sweat, stretch, tense, and toil? This factoid-filled and fun book examines the many benefits of exercise as well as the science behind it, giving insight into concepts and occurrences such as pulse rate, sweat, thirst, and muscle cramps. Practical concerns, including skin care, clothing, and a sensible diet, are also featured as essential parts of a healthy and fit lifestyle.