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That is weird race event...

A ladder is a vertical or inclined set of rungs or steps. There are two types: rigid ladders that can be leaned against a vertical surface such as a wall, and rope ladders that are hung from the top. The vertical members of a rigid ladder are called beams (US) or stiles (UK). With a bit of agility, one can slide down the stiles without climbing down each rung. Rigid ladders are usually portable, but some types are permanently fixed to buildings.Rigid ladders were originally made of wood, but in the 20th century tubular aluminium became more common because of its lighter weight. Ladders with fiberglass stiles are used for working on or near overhead electrical wires, because fibreglass is an electrical insulator.