One stunt performed is the backflip, which was disputedly completed on a 250cc motorcycle by Carey Hart using a specially designed dirt ramp. Soon after this, Mike Metzger completed this stunt using a standard freestyle ramp and dirt landing. More recently Mike Metzger actually did a Backflip over the Caesar\'s Palace Fountains Some consider the body varial 360 as the most difficult stunt being performed at this time. This stunt, also called the Carolla, was first performed by Chuck Carothers at the 2004 X Games. american, athletes, badminton, basketball, football, gimnastic, hockey, ice, motorcross, rossi, skating, soccer, swmming, valentino