“Obesity has reached epidemic proportions, with more than one billion adults overweight and at least 300 million of them clinically obese. This is a major contributor to the global burden of chronic disease and disability, with far-reaching economic consequences. Physical inactivity and poor diet will soon take over from smoking to become the number 1 killer. Awareness of the importance of nutrition has grown through the press and by actions of policy makers. However, physical activity, despite overwhelming evidence for its role in the prevention of disease, has received relatively little attention.