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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 key is that the resistance, or level of difficulty, increase as the person gets stronger. This kind of exercise can be particularly useful for seniors because people generally lose muscle strength as they age.