Cardio machines refer to a group of exercise equipment designed for cardiovascular workouts. These include treadmills, elliptical trainers, stair climbers, and stationary bikes among others. The primary purpose of these machines is to provide an effective way to improve heart health by elevating the user's heart rate and increasing blood flow throughout the body. Cardio exercises help strengthen the heart muscle, reduce the risk of developing chronic conditions such as high blood pressure or diabetes, and can also aid in weight loss. By using these machines, individuals can engage in a variety of low-impact cardiovascular workouts that are easy on the joints while still providing an effective cardio workout.