Knee scum (Climbing Move)

In bouldering, a "knee scum" is a technique where the climber uses the inside of their knee to press against the rock or hold. This move provides additional stability and balance while climbing. The climber applies pressure with the knee to maintain friction against the surface, allowing them to hold their position or make a more secure move to the next hold. This technique is useful on overhangs or when holds are sparse or slippery.

Examples

In bouldering, Jane needed extra stability to launch herself higher on the route. She pressed her knee against a protruding rock, creating a knee scum to counterbalance her body as she reached for the next hold. On another climb, Tom encountered a slippery section on an overhang. He strategically used a knee scum against the rock’s surface, which allowed him to pause and regain his footing before making a dynamic move to a small crimp. During a challenging traverse, Sarah found herself stuck without any obvious footholds. Realizing she could use a knee scum, she braced her knee against a bulge, maintaining her position and enabling her to shift her weight smoothly and keep progressing along the route.