Arnold Schwarzenegger in his 1970s muscle days

Arnold Schwarzenegger poses with an old-time weight bar during a photoshoot in the 1970s. (The shoe he's wearing, the Nike Cortez, debuted in 1972.) He was young and hungry in those days -- this was before he was a movie star -- and he won the Mr. Olympia bodybuilding title in six straight years, from 1970-75. His 1975 Mr. Olympia campaign was later featured in the 1977 bodybuilding documentary Pumping Iron.