The gray slate rocks in the quarries of Wales are a notoriously fearsome testing ground for climbing technique. Pete Robins and Nic Sellers go to the The Llanberis quarries to test themselves, waxing lyrical about its joys and providing a master class on how to climb the stuff.

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Expect lots of frictionless footholds, grim grunting and impossible, determined body positions.

Director: Rich Heap
Video Producer: Ben Pritchard
Athletes: Peter Robins, Nic Sellars