While lifting onto the toes during backwards marching many muscles are used. The flexor digitorum longus is a muscle in the leg that extends from the posterior surface of the tibia to the foot, and assists the leg in plantar flexion of the foot. Originating in the lateral condyle of the tibia and the head and shaft of the fibula, and has an insertion of the tarsal and metatarsal bones. The flexor digitorum longus divides into four parts upon insertion, connecting to the terminal bones of the four lateral toes. The tibialis posterior is located on the posterior side of the leg just as the flexor digitorum longus is, this muscle is the deepest of the muscle on the back of the leg. The tibialis posterior originates from the lateral condyle and