Getting into a role is all part of the job when it comes to acting. The emotional and physical toll that a part can take on actors can often leave them feeling completely different inside. These stars dove into their new personas without even knowing the impact it would have on them. Just how far would you push yourself to achieve a flawless performance? These actors found out...

Charlize Theron

You might have expected Charlize Theron to lose her mind thanks to her Oscar-winning performance as Aileen Wuornos in Monster, but really, it was Atomic Blonde that sent her off the rails. The 2017 film followed Lorraine Broughton, an elite spy who's willing to use all of her deadly weaponry, wit, and cleverness to keep moving forward. The pursuit of perfection was not very good for her body though...