No kidding, the 300 "workout" wasn't their training routine at all. I know most folks here are familiar with its true nature (that of a special test devised by their trainer) but for those who do not, and don't understand why this irritates many of us, you can find the info here:
http://www.gymjones.com/knowledge.php?id=35
This is the official website of the actor's physical trainers during their movie-prep.