Sofa is the only one who has hit the nail on the head...
Arnold is indeed more than a bodybuilding legend, he is infact a very smart man, with an almost unheard of drive. When he was a young teen he told his parents he wanted to be the best built man in the world. They thought he was crazy, but he did it. He always thought beyond bodybuilding though. He actually made his fortune before the movies. He invested in property. He even bought a huge amount of land in California, thinking they would one day want to buy it off of him to build a futuristic airport. As George already mentioned at 20 he set out a life map. He said he wanted to be a big star, own property, be the best bodybuilder in the world, and get into politics. I am not sure, but I also think he wrote something about wanting to marry a Kennedy. I may be mistaken.
Arnold is a true success story, and a tribute to what will and drive can get you in life.