Why is cardio important? The heart is the main organ that keeps us all going and nothing like some good ‘ol cardio to keep your heart going. Performing at least 30 minutes of any of the following cardio exercises will greatly improve your heart function and keep it pumping at a healthy pace. If you’re new to some of these exercises, be sure to take it easy at first. You can always work up to 30 minutes of exercise later when you are ready! Click here for the list.