If you're going to play a fierce army general capable of commanding 30,000 troops, you better be cut like one. And Australian actor Dan Feuerriegel is just the guy for Spartacus' army. To measure up for his character Agron (Spartacus' right hand man) Feuerriegel works his butt off to stay built. The epic series finale—a deadly march against Rome—premieres late January. We went behind the scenes with Feuerriegel to get a closer look.