The Biceps Femoris is one of the muscles located in the back of the thigh, part of the group known as the hamstrings. It has two heads: the long head and the short head. The long head originates from the ischial tuberosity of the pelvis, while the short head comes from the femur. Together, they insert into the fibula and help in bending the knee and extending the hip. This muscle plays a crucial role in various activities, such as walking, running, and jumping. It also assists in rotating the leg outward when the knee is bent. Proper strength and flexibility of the Biceps Femoris are important for overall leg function and injury prevention.