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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.
Experts explain why some people should try for 30 minutes of exercise a day, while others need up to 90 minutes.In January 2005, the U.S. government released a new set of dietary guidelines essentially telling us that as Americans get bigger, so does the length of time we need to be physically active.xperts explain why some people should try for 30 minutes of exercise a day, while others need up to 90 minutes.