Cardio machines are fitness devices designed to improve cardiovascular health and endurance. Common types include treadmills, ellipticals, and stationary bikes. These machines allow users to perform aerobic exercises, which help increase heart rate and burn calories. Using cardio machines can be beneficial for people of all fitness levels. They often come with adjustable settings, such as speed and resistance, making it easy to customize workouts. Many machines also feature built-in monitors to track metrics like time, distance, and calories burned, helping users stay motivated and reach their fitness goals.