Hill jumping (also known as yumping) is an activity that involves driving a car at high speeds up a hill in an attempt to get the car airborne at the hill's crest. In automobile rallying culture, a hill jump may be called a yump, and is sometimes referred to as such in official literature. The origin of the word yump is most likely a mispronunciation of the English word jump by speakers of languages such as Swedish that pronounce the letter J with the sound of the English letter Y.
Hill jumping is popular in rallying. Many rally cars have upgraded tires, rims, suspension, and frames that can more safely survive the stress of landing. Hills where cars may become airborne are popular spectator vantage points at rallies.
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