Climbing is the activity of using one's hands and feet (or indeed any other part of the body) to ascend a steep object. It is done both for recreation (to reach an inaccessible place, or for its own enjoyment) and professionally, as part of activities such as maintenance of a structure, or military operations. Climbing can be done in the outside world or inside via man-made structures. When climbing outside, knowing how to self-rescue is a must.
