Now it's time to flex and pose my calves for you. Take a look at the definition of the muscle. Sure, I know it isn't pro bodybuilder quality, but we can still enjoy the smaller size. MUSCLE DEFINITION is a measurement of how well we can see the shape of the entire muscle. There are two heads in the calf muscle and together, mine are looking good. HOWEVER, my calf MUSCLE SEPARATION isn't good, but I'll tell you about that another time.