Which type of rope is advised against for lead climbing due to potential risks?

Static ropes are advised against for lead climbing primarily because they are designed to have minimal stretch. In lead climbing, potential falls require a rope that can absorb the energy released during a fall to reduce the forces exerted on both the climber and the protection points. Static ropes do not have this energy absorption capability and can result in severe injury or equipment failure if a fall occurs, as they transmit the force directly through the system without cushioning.

Dynamic ropes, on the other hand, are specifically engineered to stretch under load, allowing them to absorb the energy generated during a fall. High stretch ropes, while they may have more elasticity than other types, are still not optimal for lead climbing, which typically utilizes dynamic ropes. Accessory cords are generally used for purposes other than supporting a climber's fall, such as anchors or gear loops, and are not intended for lead climbing either. This understanding of rope characteristics is critical for ensuring safety in climbing practices.