Bouldering is climbing without ropes very close to the ground, where falls are short and usually inconsequential. Boulderers practice very difficult moves on small outcrops or boulders, often trying many times before succeeding on a given boulder problem. Some use bouldering as practice for bigger climbs; others pursue it exclusively as a sport. Bouldering is one of the fastest-growing types of climbing because it involves very little equipment and technical trainlng. Boulderers need little more than climbing shoes, chalk, and perhaps a crash pad.