In the last 50 years significant numbers of men and women take little exercise in the course of their occupation. Computer keyboard, rise of private transport, world by television, household "labour saving" devices, mean that people work and play with a minimal physical effort. The benefits of doing regular exercise include a reduced risk of heart disease, stroke, colon cancer, breast cancer, osteoporosis, and obesity. In addition, many people feel better about themselves during and after exercise. Regular exercise is also thought to help ease stress, anxiety, and mild depression. This book presents the latest research in this field.