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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 maintain optimal cardiovascular health, a good body weight, and a favorable body composition, they have no choice but to conclude that all of us adults need to engage in at least one hour of moderately intensive exercise (or at least 30 minutes of vigorous exercise) each day.