The most difficult jump in figure skating is named for its inventor, Axel Paulsen, a Norwegian speed skating champion who became famous as an exhibition and trick skater. Executing the Axel jump, a skater takes off from an outside edge while skating forward, turns one-and-a-half times in the air (540 degrees), and lands on the back outside edge of the other skate. A double Axel has 900 degrees revolution and a triple has 1,260 degrees revolution.