The Flexor Hallucis Longus is a muscle located in the lower leg. It plays a crucial role in the movement of the big toe, allowing for flexion and aiding in activities like walking, running, and jumping. This muscle originates from the fibula and runs down to the base of the big toe. In addition to its primary function, the Flexor Hallucis Longus also helps support the arch of the foot. It works in conjunction with other muscles and tendons, contributing to overall foot stability and balance during various physical activities.