Arnold Schwarzenegger has revealed he believes his new autobiography is "the most fascinating immigrant story" ever told.

The erstwhile Austrian Oak was in Germany to promote Total Recall, a tome that charts how he went from Mr. Universe to The Terminator to "The Governator".

"It's a once in a lifetime situation, that's why in America so many people say this is the number one immigrant story because I cannot think of any other immigrant story that is a fascinating as this is," he said.

The book even lays bare how he fathered a secret son with his housekeeper while married to ex wife of 25 years, Maria Shriver.

"I wanted to be as honest as possible in the book and write about Maria, write about the kids, and what they meant and how much I was in love with her and how much I am still in love with her and how much I still have a desire of getting together and being the family together," he said.

But whether he realises that dream or not, he will always have his other true love to keep him company.

"I will be the kind of the guy who stands in front of a mirror on the day of Mr Olympia and say to myself, Arnold you look like shit. This body cannot win anything."