According to the narrator of the documentary on Greek sculpture, Greeks, who had impressive bodies, bared their bodies without "hesitation or shame." They believed that when gods took human form their bodies were beautiful and perfect. The Greeks believed that the more impressive their body, the more god-like they were.
The sculpture which best reflects Greek naturalism is the Kritios Boy (or Kritian Boy). According to the documentary, this sculpture best illustrates Greek naturalism because of the way the skin lies over the muscle. The sculpture looks as if the legs bear weight, and the spine lies in a “relaxed stance.” Essentially, the Kritios Boy exists as the first “truly realistic human body.”