Whether you're a beginning or longtime exerciser, in your 20s or 70s, you'll reap the cardio and strengthening benefits of low-impact, high-energy indoor walking with these two one-mile workouts from fitness guru Jane Fonda. Keeping active is a vital part of growing older gracefully, so improve brain function, boost heart health and burn fat while you enjoy a warm-up, invigorating walk and relaxing cool-down with the always-encouraging Jane.