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Some people say the you climb, the harder you fall. Those people probably wouldn’t be rock climbers.
There are about nine million rock climbers in the United States. Some do it just for fun. compete (竞赛). Rock climbing can be , but there are many ways can protect climbers. They hope to challenge through climbing.
There are several kinds of rock climbing. Traditional is done outside. Climbers use ropes and equipment to climb many of meters up. Sport climbing is similar. There is indoor climbing. Rock walls made of wood or concrete(混凝土) have places for climbers’ hands and .
Nowadays, many American teenagers take part the activity of rock climbing. It is a great way to build their confidence and strength.