Our calves are the muscles we rely on the most when we climb an incline or go down steps. They help propel us forward and keep us from falling on our faces. The calf muscle is on the back of the lower leg. It consists of two muscles: the gastrocnemius and the soleus. The gastrocnemius is the larger muscle of the calf that forms a visible bulge beneath the skin - the "heads," which create the rounded/diamond shape. The soleus is the smaller, flat muscle that lies underneath the gastrocnemius muscle. Whether you're improving your fitness or appeasing your vanity, click here for four calf-strengthening exercises. Happy workout!