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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.
Cardiovascular Exercise. The CDC recommends that adults should get 150 minutes of moderate-intensity cardio -- such as walking or a low-impact aerobics class per week -- or 50 minutes at the gym three times per week. If you're doing more intense cardio, such as running, you can scale back to 75 minutes per week.