The analysis is clear: Regular exercise extends human existence. Among the data confirming this observation are the results of the Harvard Alumni Well being Study. Over the 15 years throughout which these 13,486 males were studied, age at death was elevated significantly in proportion to the distance walked daily, the number of stories of stairs climbed daily and the quantity of vigorous physical exercise that was included in every day’s activities. An additional study of 19,223 initially wholesome males discovered that cardiorespiratory fitness reduced both the incidence of untimely death and the incidence of death from cardiovascular illness by 54%.