Need help remembering a movie's name:
-It is *not* Jason and the Argonauts
-Main character fought an evil version of himself at the end, over some lava
-Skeletons came out of the sand on a beach to fight the hero when he came out of the ocean
-There was a funny scene where the hero flexed pec muscles to show how tuff he was
-I think it was released in either the 70s or 80s
Anyone have any guesses?