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Tube riding is a term used by surfers to describe riding well inside the curve or barrel of a finely-shaped breaking wave. Under the right conditions, waves in some areas, such as the Banzai Pipeline in Hawaii, form a moving "tube" or cylinder as they break.
The most straightforward way to tube ride is by body surfing. By riding the waves on his or her belly without a board, a body surfer may access the tube with relative ease, even in the case of a moderately small barreling wave. It is also possible to tube ride using a boogie board, surfboard, or other wave riding implement. However, tube riding is an advanced skill and some surfers spend years surfing without ever really getting "tubed" — the term for being inside the barrel of the wave.