Schwarzenegger began weight training at the age of 15. He won the Mr. Universe title at age 20 and went on to win the Mr. Olympia contest seven times. Schwarzenegger has remained a prominent presence in bodybuilding and has written many books and articles on the sport.
His life story is a legendary one. It's very helpful for people to motivate. I found it on YouTube.
Here is the link for his life story video (FULL)
http://www.youtube.com/watch?v=YhcIvO7Pyjk