When walking, a series of neural processes occur to facilitate coordinated muscle contraction. Signals are sent from sensory neurons in the spinal cord to motor neurons, activating motor units and causing muscle fibers to contract. Both fast twitch and slow twitch fibers are used, with more reliance on slow twitch fibers for continuous walking. Muscle spindles and golgi tendon organs provide feedback on muscle length and force to ensure proper gait. Over time, motor unit plasticity results in neural adaptations that optimize walking performance.