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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.
What Is Moderate Exercise? March 17, 2009 -- What exactly is moderate exercise? A new study suggests the much-touted moderate-intensity walk should translate to about 100 steps per minute, or 3,000 steps in 30 minutes. Federal exercise recommendations call for Americans to get at least 150 minutes per week of moderate exercise for optimal health.