Statues for the Renaissance time have such amazing muscular detail. Was weight training a common part of life for the models to get this much detail? Or was it the sculptors' exaggeration that made the statues have the structure that they do? When did weight training become a part of life?
It doesn't directly answer your question, but while you're waiting, you might be interested in this comment thread on ancient physique, with answers from /u/rittermeister and /u/hergrim