Walking for 30 minutes a day five or more days a week at moderate or hard intensity, or walking three to four times a week at hard intensity can lead to significant long-term improvement in cardiorespiratory health according to the results of a new two-year study of 500 sedentary men and women aged 30 to 69. The key to getting these results is either high-frequency or hard-intensity walking report the researchers.

Source: Archives of Internal Medicine, November 14 , 2005.