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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.
How much cardio you do should be based on what your health and fitness goals are and what you are physically capable of doing. If you are trying to make a healthy lifestyle change then consider 30 minutes of moderate cardio (walking, hiking, biking) 5-7 days per week.