Kristen Stewart felt \"untouchable\" when she was wearing her battle costume in her new movie. The 22-year-old actress stars in Snow White and the Huntsman, which features several fight scenes. Kristen may not be the most imposing figure, but she felt far braver once she put on her armour. \"As soon as the armour goes on, you feel untouchable - but it\'s a different thing for a 5ft 5ins, 110-pound girl to go into battle,\" she told Parade. \"When we first meet Snow White, she\'s been in prison for over ten years, and the land she knew has been destroyed. She has to find a way to survive, so she becomes an action hero out of instinct.\" Kristen underwent months of gruelling training to prepare for the warrior role. In fact, the star\'s body changed so much she barely recognised herself at times. She loved taking part in the physical scenes, particularly when it came to fighting male members of the cast. \"I did fight training with a cardboard sword and foam shield, and I definitely gave the guys a good whacking occasionally,\" she laughed. \"But when I got to the set, it was like, \'No, you look like a ninja. Forget the choreography and try not to die.\' The real sword was heavy - my arms got so ripped, I would look down and not recognise myself. \"Snow White is such a cool character. I respect her compassion; she struggles with the idea of taking up arms. But I am slightly more aggressive. That\'s not a struggle in real life for me.\"