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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.
To improve overall cardiovascular health, the American Heart Association recommends at least 150 minutes of moderate exercise or 75 minutes of vigorous exercise per week â or a combination of the two for adults.