What is the primary role of the hamstring group?

The primary role of the hamstring group is to extend the hip and flex the knee. This group of muscles, which includes the biceps femoris, semitendinosus, and semimembranosus, is located at the back of the thigh. When the hamstrings contract, they pull the thigh backward at the hip joint, leading to hip extension. Simultaneously, they allow for the bending of the knee as they work in coordination to bring the lower leg closer to the back of the thigh.

The hamstring's dual action is essential for various activities such as walking, running, and jumping, where a combination of hip extension and knee flexion is frequently required. Understanding this function is crucial for recognizing the importance of the hamstrings in both athletic performance and rehabilitation contexts.