175 and shredded at 5'10"? That's bigger than you think. It is certainly larger than those spartans. Bruce Lee was REALLY lean and very dry in his movies. You drop a lot of bodyweight getting that cut.
And also, if you want to look like the dudes in 300, that is totally a realistic goal. It'll take time, but it is more than realistic. The guys in that movie weren't impressive given today's standards. MAybe 2000 years ago.