Cardio exercises, short for cardiovascular exercises, are activities that increase your heart rate and improve blood circulation. Common forms of cardio include running, cycling, swimming, and dancing. These exercises help strengthen the heart and lungs, making them more efficient at delivering oxygen to the body. Engaging in regular cardio workouts can provide numerous health benefits, such as weight management, improved mood, and reduced risk of chronic diseases like heart disease and diabetes. It's recommended to aim for at least 150 minutes of moderate-intensity cardio each week for optimal health.