Solo climbing or soloing is a style of climbing in which the climber climbs alone, without somebody belaying him. There are two ways to climb solo: it can be performed with the safety of a rope and a self-locking device, in which case it is a form of aid climbing called roped soloing or it can be done without any rope or other form of protection in which case it is a form of free climbing called free soloing. Climbers on Valkyrie at the Roaches. ... In climbing, belaying is the technique of controlling the rope so that a falling climber does not fall very far. ... Self-locking devices are devices intended to arrest the fall of climbers who climb alone (known as solo climbing). ... Aid climbing is a style of climbing in which fixed or placed protection is used to make upward progress. ... To make climbing as safe as possible, most climbers use protection to prevent injury to themselves and others. ... Free climbing is a style of climbing in which the climber uses no artificial aids to make progress upwards, but just hands, feet and other parts of the body. ...

Free soloing is considered the purest form of climbing but is also the most dangerous. It is mostly practiced on routes that are familiar to the climber and where its difficulty lies well below the climber's abilities. However, inherent risks such as loose rocks or sudden change in weather are always present and fatalities are not unknown to the practice. Free soloing belongs to the group of extreme sports. Extreme sports (now also known as action sports) is a general, somewhat hazily-defined term for a collection of newer sports involving adrenaline-inducing action. ...

Free soloing on seacliffs, where a climber falling into deep water may avoid injury, is known as deep water soloing. Solo climbing or soloing is a style of climbing in which the climber climbs alone, without somebody belaying him. ...