Scarlett Johansson's Iron Man Shape Up: Butt Kicking And Low Carbs

08/27/2009 05:12 am ET | Updated May 25, 2011

Even enviable-looking Scarlett Johansson couldn't disguise her fear at having to don a skintight catsuit for her Iron Man 2 role as the Russian spy Black Widow.

"I kicked some major butt," the actress, 24, told PEOPLE at Comic-Con of her training regimen to make her a shapely superhero ready for acrobatic battle scenes. "It was many, many, hours, days, and months of stunt training and strength training, but it's fun because I had a goal. The goal was the Lycra catsuit."

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