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Equipment anatomy

Ski Parts

An alpine ski labelled from above and from the side: the tip and tail, the narrow waist that gives the ski its shape, the steel edges along both sides, the binding, and the camber that arches the ski away from a flat surface.

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Ski partsAn alpine ski seen from above and from the side, with its parts labelled: the tip, the tail, the narrow waist that gives the ski its shape, the steel edges along both sides, the binding that holds the boot, and the camber that arches the ski away from a flat surface.TipTailSteel edgeWaistBindingCamber, seen from the sideThe unweighted ski arches off a flat surfaceTilting the ski on edge presses the ends downand bends this shape into a turning arc

Questions

Why is a ski narrower in the middle?
The waist is narrower than the tip and tail so that tilting the ski on edge presses the ends into the snow and bends the ski along its length. The bent edge then describes an arc, which is what turns the ski without it having to be pushed sideways.