Robert Downey Jr has admitted that despite working with the Iron Man suit for a second time he still struggles with it.
The actor reprises the role of Tony Stark aka Iron Man, which is released later this year, after the success of the first movie back in 2008.
In an interview with Film Reporter the actor said: "Well the suit was a bit lighter, but not light enough for my liking.
"I had more self-confidence shooting the second film, but I wouldn't say we had fun. We wanted to take more time.
"We extended the cast and our horizon und made the story more complex and subtle, although it's still easy to follow.
"We really looked into the storyline thoroughly to make it as good as possible."
Jon Favreau is back in the director's chair and Gwyneth Paltrow is also returning to the franchise as Pepper Potts.
And there are a whole host of names joining the cast list including Scarlett Johansson, Mickey Rourke and Sam Rockwell.
Don Cheadle is replacing Terrance Howard as Lt. Colonel James Rhodes and Samuel L. Jackson is also returning as Nick Fury.
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