A multifunctional treadmill is a type of treadmill that offers more than one function. For example, some multifunctional treadmills have an incline feature that allows you to adjust the angle of the belt, which can simulate walking or running uphill. Other treadmills may have built-in programs that offer a variety of workout options, such as interval training or heart-rate-based workouts. Some treadmills even have features like iPod docks and television screens.