Nelson Montana said:
One: Walking. LOTS of walking. This is what early man and all animals in the wild do in search of food. But we no longer have to walk, so we get fat -- fatter every year. If people walked more, they'd burn more calories and they'd do it without stressing the joints or increasing oxidation with sustained heavy breathing. No one ever overtrained by walking too much.
So if you walked on a treadmill for forty five minutes three times at a 4.0, you would be walking three miles each session. Would you consider that cardio for a person who has an office job?