The short form for “cardiovascular” we often use, is “Cardio”. The term cardiovascular includes both the heart (cardio) as well as blood vessels (vascular). Walking involves your heart and lungs, as well as your large muscle groups. Hence, walking can be considered as a type of cardiovascular activity or we can say cardiovascular workout. If you want to strengthen your cardiovascular system, you need to increase your pace, duration and intensity of walking.