Ok, so Arnold Schwarzenegger is kind of a joke of his former glory anymore, but back in the day, Arnold was the biggest action star ever! Even if he wants to spoil his legacy by co-starring in action films with Johnny Knoxville (how did he possibly fail to make the list of the best action stars??), he was the Terminator, man. All the rest of these guys (and ladies) are the best of action movies. From being tough enough to walk on broken glass (Bruce Willis) to being able to do the splits in any situation and make it look like that's just the kind of thing people do in everyday life (Jean Claude van Damme, you are a splits master), these are the greatest action stars ever to grace the big screen.