The muscles of the lower leg consist of the gastrocnemius and soleus muscles which together are known as the calf muscles, the peroneus longus, peroneus brevis, extensor digitorum longus, extensor hallucis longus, tibialis anterior, tibialis posterior, flexor digitorum longus and flexor hallucis longus.
Flexor Digitorum Longus causes the toes to grip and mold to the floors surface which is vital in maintaining balance on rough surfaces. Walking barefoot on an uneven surface is an excellent exercise for this muscle.
Peroneus Brevis is one of the peroneal muscles which pass down the outside of the lower leg and evert the foot. These muscles are sometimes referred to as Fibularis brevis, longus and tertius due to their attachments on the fibula.
Peroneus Longus is one of the peroneal muscles which pass down the outside of the lower leg and evert the foot. These muscles are sometimes referred to as fibularis longus, brevis and tertius due to their attchments on the fibula.
Gastrocnemius is the largest and most superficial of the calf muscles. Together the Gastrocnemius, Soleus and Plantaris are known as Triceps Surae. The Gastrocnemius is the main propellant in walking and running.