The larger of the 4D SlideBoard, the 4D Extreme takes all the uses of the 4D SlideBoard and adds much more. The size of the 4D Extreme allows for multiple athletes to train together. The 4D Extreme can be used for group classes and is used by coaches in private and semi-private off-ice lessons. Pairs and Dance can also use the 4D Extreme as part of their training, replicating the feel of movement across the ice in lifts and moves. The 4D Extreme can be used for complete off-ice program run-throughs with smooth and natural transitions.