"Extra" is going behind the scenes with Oscar-nominated star turned comic book superhero Robert Downey, Jr. -- and he's dishing about having to pump it up to become "Iron Man!" The rigorous training that Downey endured is more than the actor originally wanted. "I trained enough not to over-train, but still trained five thousand times more than I wanted to," admits Downey.

His iron pumping has certainly paid off -- and Robert is sure to attract more fans after his ripped physique is debuted on the big screen. However, he brushed off his new buff bod as simply another part of earning his paycheck, saying, "I'm happily married and I have a kid. This is my job."

It's clear that Downey's favorite job is being a doting dad to his teenage son Indio -- proving that this star may be ready to up his fatherly duties with another child! When asked about wanting more children, Robert replied, "Yes, I'm thinking about it."

Catch the lean, mean Robert Downey, Jr. and his abs of steel -- when "Iron Man" flies into theaters today!