Climbing is the activity of using one’s hands, feet, or any other part of the body to ascend a steep object. It is done recreationally, competitively, in trades that rely on it, and in emergency rescue and military operations. It is done indoors and out, on natural and manmade structures. Bouldering is a form of rock climbing that is performed without the use of ropes or harnesses. While it can be done without any equipment whatsoever, most climbers use climbing shoes to help secure footholds, chalk to keep their hands dry.