Qinggong is a technique in Chinese martial arts. Its use has been exaggerated in wuxia fiction, where martial artists have the ability to move swiftly and lightly at superhuman speed, perform gravity-defying moves such as gliding on water surfaces, scaling high walls, and mounting trees. In some wuxia and martial arts films containing elements of wire fu, Qinggong stunts are simulated by the actor or stuntman suspending himself from wires. In traditional Baguazhang training, Qinggong is involved. The practitioner runs up a plank supported against a wall. The gradient of the plank is increased gradually over time as his training progresses.