New Delhi, July 28 : Hollywood actress Scarlett Johansson loved filming fight sequences in her upcoming `Iron Man' sequel.

The 24-year-old actress plays Natasha Romanoff and her alter-ego, sexy Russian spy Black Widow in the Iron Man 2 and insists she enjoyed working on the comic book adaptation.

"I''m kicking some major a*s - so I would say ''major'' is the amount of a*s I kick," said Johansson.

"Whose a*s do I kick? Well, you''re just going to have to wait and see. You don''t really want to know, do you?" she added.

Johansson revealed that she spent months training for the physical role but despite the hard work, the physical sequences were her favourite scenes to film, reports China Daily.

"Well I have to say I loved doing all my stunt sequences, because those are the ones I know best. I''ve got to fight for them. I''ve got to be my own cheerleader. So, all the Black Widow sequences, of course," she said.

"Whose side is she fighting on? I don''t know. I think you''ve just got to call me a super shape-shifter," she added.

''Iron Man 2'' also stars Robert Downey Jr., Gwyneth Paltrow and Mickey Rourke and is due for release in May next year. (ANI)