Aerobic or cardiovascular exercise is any form of activity that increases your respiratory and heart rate, essentially challenging your heart to work harder and become stronger. Cardiovascular fitness will improve the way your body uses oxygen. As your heart becomes stronger, you will find that you aren't winded walking up the stairs, you can perform physical activity longer, and your resting heart rate will be lower, meaning your heart is more efficient at pumping blood through your body. Though any aerobic exercise is good for your heart, these five physical activities are top-notch for heart health.