Cardio isn’t even the type of exercise. Health professional recommend it as exercise, because they don’t want to risk being specific.
Cardio has an effect on your heart, thats why is defined as aerobic exercise, but people forget that intense exercise works heart much more then easy aerobic exercise.
The key to changing your body, staying young and sexy is to do more high intensity exercise. I am not saying that all cardio training is bad, it just shouldn’t be the only exercise you do!