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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.
Work Up a Sweat. The American Council on Exercise recommends at least 30 minutes of cardiovascular exercise each day. Your gym will provide a variety of cardiovascular machines such as treadmills, stair climbers, bicycles, rowing machines, elliptical trainers and arc trainers. Your goal is to choose one that you enjoy and work vigorously on it for 30 minutes.