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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.
The American College of Sports Medicine and the CDC recommend, for health, that adults should accumulate 30 minutes of moderate-intensity physical activity on most days of the week, says Kravitz, who is also a coordinator of exercise science at the University of New Mexico.