Arnold Schwarzenegger Talks 'Terminator 3'

"The key thing is that when people come out of the theater they say, 'Wow, I was really amazed.' That they really stepped up and they made this movie better than the last one. This is what this is all about. Everyone is trying very hard to outdo the last Terminator movie."

What's different this go around are the additions of cast members Claire Danes and Nick Stahl and a female terminator, the "T-X" played by Kristanna Loken. What does remain the same is Arnold's physique -- he bulked backed up for the movie. "The muscles have a memory so that whenever I don't train heavy I reduce in size. For certain films it's better to weigh less and for certain films it's better to weigh more," said Arnold.