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Skimboarding (or skimming) is a boardsport in which a skimboard (a sort of little surfboard) is used to ride on an incoming wave. Unlike surfing, skimboarding begins on the beach, with the skimboarder running and dropping their board onto the thin wash of previous waves. They use their momentum to 'skim' out to breaking waves, which they then catch back into shore in a manner similar to surfing. Another aspect of skimboarding is 'flatland' which involves performing more skateboard orientated tricks such as ollies and shuv-its on the wash of waves without catching shorebreaks.

Source: Wikipedia http://en.wikipedia.org/wiki/Skimboarding