I walk a brisk 40 miles a week since recovering from a double by-pass nearly two years ago. I have the Ohio&Erie Canal running past my residence and use it in nice weather. I walk in shopping malls or do aerobics (Walk Away The Pounds) in bad weather. I just had a complete work-up by my cardiologist (stress test, ekg, ultrasound of the heart and a plaque test). He was not only pleased but impress with the results. The plaque level should be under 200 to prevent clogged arteries and mine is at 50. Better than HIS level by half. He attributes it to all the walking. So by all means everybody should get off their duffs and walk if at all possible.