Article: Number of Calories Burned is Key Says the Harvard Heart Letter.

BOSTON, June 29 /PRNewswire/ -- The guidelines regarding just how much weekly exercise is needed for optimal health seem to be a moving target. To ease the confusion, the July issue of the Harvard Heart Letter suggests concentrating on the number of calories burned.

Although there is debate about how long you need to exercise for good health, most experts acknowledge that burning calories is the means to maintaining a healthy weight. According to a recent Harvard study, burning an extra 700-2,000 calories a week through some form of dynamic exercise garners significant health benefits. The amount of calories burned during a workout depends on a person's weight, ...

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