Amanda Seyfried - Amanda Seyfried's Exercise Importance

Amanda Seyfried admits she has to work hard to stay in shape.

The 'Mamma Mia!' actress says it's important for her to maintain her svelte figure because of the job she has and does it with regular exercise and sensible eating.

She said: "If I didn't run and work out, there's no way I would be this thin. But I have to stay in shape because I'm an actress. It's f**ked up and it's twisted, but I wouldn't get the roles otherwise. If I'd been bigger, I don't think they would have cast me for 'Mamma Mia!'.

"If I have to diet, it's salad with protein, salmon and broccoli, no desert. But what kind of life is that? So I work out a lot and I'm just pretty moderate about what I eat."

Amanda also admitted she may have cosmetic surgery when she's older.

The 24-year-old beauty told Britain's Glamour magazine: "My boobs hang pretty low. I might get a little breast lift. Maybe in my 30s or 40s."