Robert Pattinson, Kristen Stewart hit the gym before intimate scene

Real-life couple Kristen Stewart and Robert Pattinson had to work out before shooting an intimate scene for their upcoming movie `Twilight Saga: Breaking Dawn`.

The real-life couple`s alter egos Bella Swan and Edward Cullen get intimate in a scene in the final installment in the vampire franchise. But they realised at the last minute that their fans would not want to see them looking out of shape.

"I know I`m tiny. I did `On the Road` right before `Breaking Dawn` and I definitely did hang out a little bit. Then when I was doing prep for `Breaking Dawn`, I suddenly realised, `This is so not `On the Road`. People definitely want to see you looking trim,`" femalefirst.co.uk quoted Stewart as saying.

"Usually, we`re all making fun of Taylor Lautner for working out so often, and then suddenly me and Rob (Pattinson) were like, `S**t` and running around the block while Taylor laughed at us," the 21-year-old added.