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How Long. For walking, bike riding or other moderate exercise -- rigorous enough so that it's hard but not impossible to talk -- seniors should slowly build up to 30-minute workouts. And if 30 minutes all at once is impossible, two 15-minute sessions or three 10-minute workouts are fine.
Those of you who can fit in an hour or two of exercise a day need read no further. But for the rest of us, the real question is: How much exercise do we really need in order to see at least some substantial cardiovascular benefit?