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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.
A teenager should exercise just as much as an adult should, which is 60 minutes a day. 30 of these said minutes can be spent simply walking to class in school. But then you ne â¦ ed another 30 minutes of hard exercise that will keep your heart pumping.