The 28-year-old actress appears in every frame of the movie, in which she plays a woman trapped on a rock in the middle of the ocean as a shark circles her, and after undertaking a similar project of his own in 2010's "Buried", her husband told her she needs to be ready for a very tough experience, reported Female First.
The actress, said that Reynolds told her, "This is going to be an athletic event. Prepare yourself. It will beat you up emotionally, it will be rewarding. It will be the most physical thing you've ever done in your life. Don't be thrown by that.