I had never stepped inside a gym before playing Black Widow: Scarlett

Actress Scarlett Johansson said she had "never" stepped inside a gym before being asked to portray the character of Natasha Romanoff/Black Widow in 2010 movie 'Iron Man 2'. "I had five weeks to prepare myself for these huge stunt sequences," added Scarlett. 'Iron Man 2' also starred Robert Downey Jr and Samuel L. Jackson.