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A slab climber at Looking Glass, North Carolina
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Slab climbing is a type of rock climbing where the rock face is at an angle less steep than vertical.[1] It is characterized by balance- and friction-dependent moves on very small holds.[2] It is often not leadable, or climbable from the ground up, unless it has pre-drilled bolts to protect the climb, making most slab climbs either top rope climbingorsport climbing. Special techniques such as smearing are necessary to climb slab. It is a type of face climbing and is distinctly different from crack climbing. Slab climbing is a relatively new area of climbing, having become more popular in the last 30 years, and some of the highest graded routes are currently being realized.
Slab climbing is one of the most technically demanding styles of climbing. Unlike overhanging or vertical routes, where strong muscles are very important, slab climbing demands intense concentration and precise foot placement.
A central technique used on slab walls is smearing: placing a foot directly on smooth rock where no feature exists. Pressure is applied and the friction between the shoe and the rock allows the climber to move on the wall. Smearing performance depends on a climber's shoe and the type of rock. Sticky rubber shoes increase friction. Smooth rock, such as quartzite, is difficult to smear on, while sandstoneorgranite is much easier. The angle of the slab also plays a large part in the difficulty of the move. A 60 degree slab is easier to smear on than an 80 degree slab. A good smear also puts as much shoe in contact with the rock as possible. The foot should be kept flat, instead of using just the points of the toes to smear.[3]
Climbers must keep their center of gravity directly above their feet in slab climbing. A climber that keeps their weight too close to the wall risks pushing their feet off the wall. This means a climber will often have their hips away from the rock, which is the opposite of traditional climbing technique.[4] A climber’s hands are often used to assist in this positioning by pushing out against the wall.
Slab climbing requires smooth movement over the rock, instead of long, jerky moves. Short steps should be taken to maintain balance, and the arms should be kept in contact with the rock. Slab climbing almost never has dynamic moves.[5]
Falling is usually dangerous on slab because of poor protection and the nature of the rock. The climber will often slide or tumble down the rock, instead of dropping through the air. This can cause serious skin injuries. When falling, climbers try to stay upright and slide instead of tumbling.
Rough rock is excellent for slab climbing. Sandstone and granite are both excellent for slab climbing, because the rock provides much friction, making smearing easier. Limestone slab climbs are more difficult, due to the smoothness of the rock, and quartzite slab climbs are even rarer due to the polished nature of the rock.
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