Bouldering

A type of rock climbing that does not involve ropes. Instead climbers carry around crashpads to fall on because they do not go high enough to hurt themselves.

Because we were going bouldering I had to swap my rope for my crashpad.

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Buildering

"Rock climbing" or "bouldering" on buildings.
Usually done with no rope, perhaps a crash pad and climbing shoes. Bridge supports, retaining walls, strangely shaped buildings and modern art (where there are no security guards) are popular buildering spots.

When rock climbers are stuck in a city with no rock to be found they go buildering.

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