chimneying

Chimneying is a climbing technique used to ascend narrow vertical or near-vertical fissures that are too wide to hug but too narrow to stem. The climber uses opposing pressure between their back and their feet or knees to move upwards. This involves pressing their back against one wall of the chimney and their feet or knees against the opposite wall. The grip on the rock is typically less important than the wedging action.

There are several variations of chimneying. Straight chimneying involves keeping the body relatively upright and using the opposing pressure of the back and feet. Wider chimneys may require a more horizontal body position, with the climber pressing their back and one side against one wall and their feet and hands against the other. This is sometimes referred to as "lie-back" chimneying. In very tight chimneys, the climber might need to use their hands for additional leverage, pushing or pulling against the walls for support.

The effectiveness of chimneying depends on the width and texture of the fissure. A rougher texture provides better friction for the feet and hands. The technique requires significant strength and endurance, particularly in the legs and core. It is a common technique in crack climbing and has applications in mountaineering and canyoneering. Proper technique is crucial to avoid exhaustion and injury, and climbers often practice this skill in controlled environments.