If you ever been to a doctor, the first thing they do is convince you to do low to moderate intensity aerobic training. This is also referred to as cardio. They suggest you do about 30-60 minutes of steady pace cardio for about 3-5 times in a week. They claim this helps maintain your heart rate at a moderate level.
Before you get involved in such a routine, consider some recent scientific research that gives concrete facts to prove such cardio workouts may not work that well after all.