Aerobic activity helps older adults burn off calories, lower blood pressure and cholesterol levels, maintain joint movement, improve heart health, and increase energy levels overall. Building endurance may take some time, depending on your health and activity level. Try starting with 5-minute cardio sessions a few days a week to raise your heart rate. From there, work toward eventually completing 30 minutes of aerobic activity on most days. Moderate endurance exercise for seniors includes walking briskly, tennis, and swimming; more intense aerobic activities include hiking and running.