Jennifer Aniston has one of the most healthiest and fit bodies in Hollywood, and she's making it no secret that she is grateful for it. The actress recently opened up about the transitions she went thru while prepping for her role in her latest film, Cake.

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In an interview with NPR on Saturday, Aniston says that her character Claire went through both emotional and physical pain and was an experience that she says she'll never forget.

She told the site, "You really do not know what happened to this woman. As the story unfolds you slowly start to discover bits of information as to what happened and why she is in this state."

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She added, "It was a lot of studying the back, the leg, the neck. Pretty much every single part of her body was hurt, injured. And you really do start to manifest odd little, you know, cricks and ... pinches in your neck and lower back pain. ... Talking to women, or men, who are suffering from chronic pain on a daily basis - it is so unimaginable. I mean, I was so grateful for my body at the end of the day."

Aniston also opened up on whether or not she is in the point of her career that she can pick and chose the projects she wants to be a part of.

She explained, "Well, you can and you can't. The truth is: you can become established in a certain category, and I think you are given, you know, offers and opportunities based on how the industry sees you fitting into that - that job. And sometimes you have to kind of take the reins yourself or take a project on and get it made independently so that you can do that work [that] not necessarily another director or studio would see you, you know, fit for. It is, I've said, such a catch-22."

Cake is currently in limited release in theaters nationwide.

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