Acting is like peeling an onion. You have to peel away each layer to reveal another.
I believe that being an actress or being involved in a movie has to be a life experience, otherwise why go for it? I have to change me, and I have to learn things, and I have to push me and my limits. By acting, I find a freedom inside of a prison in a way.
Acting is a tough business, and you need to be in good shape mentally and physically.