The main purpose of cardiovascular exercise in a fitness regimen is to improve heart and lung health. This type of exercise, which includes activities like running, cycling, and swimming, elevates heart rate and increases blood circulation, promoting efficient oxygen use throughout the body. Cardiovascular workouts enhance overall stamina and endurance, contributing to better physical performance in daily life and athletic pursuits. Additionally, engaging in regular cardio can aid weight management, boost mood, and reduce the risk of chronic diseases such as heart disease and diabetes.