Supposedly, this is the workout that the actors in the movie 300 used to get their lean physiques. It looks pretty brutal, especially the pull-ups and the "floor wipers". I might try it just for a switch up though. I doubt I can do the 50 reps each exercise calls for though. Basically, it's a 300 rep workout with no rest, switching exercises after 50 reps (25 with pull-ups).