The definition of a cardio workout is any workout that raises your heart rate. Cardio exercise can be aerobic, meaning there is a steady flow of oxygen throughout the workout, or anaerobic, meaning there is no flow of oxygen during the workout (i.e., swimming for cardio). Cardio is effective at helping you reach your goals, and, according to the American Heart Association, should be practiced for 150 minutes per week to keep a happy and healthy heart. We wanted to…