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Crack climbing is a type of rock climbing in which the climber follows a crack in the rock and uses specialized climbing techniques. The sizes of cracks vary from those that are just barely wide enough for the fingers to fit inside, to those that are so wide that the entire body can fit inside with all limbs outstretched. Many traditional climbing routes follow crack systems, as they provide natural opportunities for placing protective equipment. == Widths == In the context of climbing, cracks are classified by their width in relation to the climber's body: finger, off-finger, hand, off-width, and chimneys. * Finger cracks are just wide enough for all or part of the finger to fit inside; this width incorporates techniques used in face climbing and tends to favor climbers with small hands. * Off-finger cracks, also called "off-hand", are wider than finger cracks, but not large enough for the entire hand to fit inside.〔 * Hand cracks are just large enough for the entire hand to fit inside; the techniques for this width are "readily learned and very secure".〔 * Off-width cracks are wider than hand cracks, but not wide enough for the legs or upper body to fit inside; this width is the most difficult to master, as it requires movements that can be physically awkward or uncomfortable.〔 * Chimney cracks are large enough to fit the entire body inside, allowing for a wide variety of techniques depending on the distance between the two rock faces.〔 The walls of crack systems rarely run parallel to each other throughout the entire length of the crack; they frequently constrict inwards and open outwards in various places. Some of the most challenging climbs follow cracks which run through many different widths. Even when a crack is uniform in width, it may require a different approach for each individual climber—a hand crack for a smaller climber may be an off-finger crack for a larger climber.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Crack climbing」の詳細全文を読む スポンサード リンク
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