The in-line roller blade can skate forward, backward, sideward, turn right, turn left and spin to serve as a figure skate. The in-line roller blade figure skate and skateboard comprise a composite belt enwraping around the wheels. The composite belt comprises the resilient belt, string and beads. The self-propelling mechanism can rotate the wheel that the rider can skate without pushing against the ground. These two techniques can be applied to the ice skate to have the sideward skating capability.