Cross-pressure holds do not exist as useful single
holds, but must be used in combinations by exertion of opposing pressure between hands, arms, and legs. There are several types: (a) The pinch hold—the pinching of a protruding part between the fingers, (b) Pressing outward or pulling inward with the arms, (c) The lie-back—a lying back to one side of an offset crack, with the hands pulling and the feet pushing against the offset side, (d) Inverted pull or push holds, sometimes called underholds—permitting opposing pressure between hands and feet, (e) Chimney climbing—exertion of cross pressure between the back and the feet or hands or knees.