As far as blacksmiths go, few are as ripped or beefy as Hephaestus, the Greek god of metalworking (among other things). No wonder blacksmiths are often portrayed as big, ripped beefcakes. Just thinking about all that bashing of metal over searing hot fuel in order to create a sword or a battle axe is tiring enough.
Working a forge in the days of yore was no joke.