The SKI-JUMP! is for making skiing more exciting in the Lego world. Before the SKI-JUMP! (in the first video clip) Lego skiing looked like a minifigure sliding down a slope and coming to a stop at the end. But now with the SKI-JUMP!, an RCX calculates their speed in SPS (Studs Per Second), and at the end, they are flung into the air, producing a variety of stunts (and I'm proud to say that in the very last clip, the minifigure does a full flip).