
Schwarzenegger is considered among the most important figures in the history of bodybuilding, and his legacy is commemorated in the Arnold Classic annual bodybuilding competition. Schwarzenegger has remained a prominent face in the bodybuilding sport long after his retirement, in part because of his ownership of gyms and fitness magazines. He has presided over numerous contests and awards shows. For many years, he wrote a monthly column for the bodybuilding magazines Muscle & Fitness and Flex. Shortly after being elected Governor, he was appointed executive editor of both magazines, in a largely symbolic capacity. The magazines agreed to donate $250,000 a year to the Governor's various physical fitness initiatives. The magazine MuscleMag International has a monthly two-page article on him, and refers to him as "The King."

One of the first competitions he won was the Junior Mr. Europe contest in 1965. He won Mr. Europe the following year, at age 19. He would go on to compete in and win many bodybuilding contests, as well as some powerlifting contests, including five Mr. Universe (4 — NABBA [England], 1 — IFBB [USA]) wins, and seven Mr. Olympia wins, a record which would stand until Lee Haney won his eighth consecutive Mr. Olympia title in 1991.
In 1967, Schwarzenegger competed in and won the Munich stone-lifting contest, in which a stone weighing 508 German pounds (254 kg/560 lbs.) is lifted between the legs while standing on two foot rests. Schwarzenegger has said the following on his size: "During the peak of my career, my calves were 20 inches, thighs 28.5 inches, waist 34 inches, chest 57 inches, and 23-inch arms."
In a full squat (buttocks close to ground) Schwarzenegger had a personal record of 181 kg/400lbs. for twelve repetitions.
Schwarzenegger's goal was to become the greatest bodybuilder in the world, which meant becoming Mr. Olympia. His first attempt was in 1969, when he lost to three-time champion Sergio Oliva. However, Schwarzenegger came back in 1970 and won the competition making him the youngest ever Mr. Olympia at the age of 23, a record he still holds to this day.

He continued his winning streak in the 1971 – 1974 competitions. In 1975, Schwarzenegger was once again in top form, and won the title for the sixth consecutive time, beating Franco Columbu. After the 1975 Mr. Olympia contest, Schwarzenegger announced his retirement from professional bodybuilding.
Months before the 1975 Mr. Olympia contest, filmmakers George Butler and Robert Fiore persuaded Schwarzenegger to compete, in order to film his training in the bodybuilding documentary called Pumping Iron. Schwarzenegger had only three months to prepare for the competition, after losing significant weight to appear in the film Stay Hungry with Jeff Bridges. Lou Ferrigno proved not to be a threat, and a lighter-than-usual Schwarzenegger convincingly won the 1975 Mr. Olympia. After being declared Mr. Olympia for a sixth consecutive time, Schwarzenegger retired from competition.
Schwarzenegger came out of retirement, however, to compete in the 1980 Mr. Olympia. Schwarzenegger was training for his role in Conan, and he got into such good shape because of the running, horseback riding, and sword training, that he decided he wanted to win the Mr. Olympia contest one last time. He kept this plan a secret, in the event that a training accident would prevent his entry and cause him to lose face. Schwarzenegger had been hired to provide color commentary for network television, when he announced at the eleventh hour that while he was there: "Why not compete?" Schwarzenegger ended up winning the event with only seven weeks of preparation. After being declared Mr. Olympia for a seventh time, Schwarzenegger officially retired from competition.

Schwarzenegger has admitted to using performance-enhancing anabolic steroids while they were legal, writing in 1967 that "steroids were helpful to me in maintaining muscle size while on a strict diet in preparation for a contest. I did not use them for muscle growth, but rather for muscle maintenance when cutting up." He has called the drugs "tissue building."
In 1999, Schwarzenegger sued Dr. Willi Heepe, a German doctor who publicly predicted an early death for the bodybuilder, based on a link between steroid use and later heart problems. Because the doctor had never examined him personally, Schwarzenegger collected a DM20,000 ($12,000 USD) libel judgment against him in a German court. In 1999, Schwarzenegger also sued and settled with The Globe, a U.S. tabloid which had made similar predictions about the bodybuilder's future health. As late as 1996, a year before open heart surgery to replace an aortic valve with a human homograft valve, Schwarzenegger publicly defended his use of anabolic steroids during his bodybuilding career.
Schwarzenegger was born with a bicuspid aortic valve, an aortic valve with only two leaflets (a normal aortic valve has three leaflets). Both his father and his brother had the same condition.
Article Source: www.wikipedia.org