A FreeMotion treadmill is a type of treadmill that is designed to provide a more natural walking or running experience. Unlike traditional treadmills, which have a belt that moves around a set of rollers, a FreeMotion treadmill has a deck that moves along an underlying track. This design allows for a more fluid movement and can mimic the feeling of walking or running outdoors. Additionally, FreeMotion treadmills often have more features and options than traditional treadmills, such as the ability to change the incline and decline.