Cameron Diaz is one fit actress, especially at the age of 40.   So just how does she do it?  You’ll find out in her health, wellness, and fitness book that Harper Collins commissioned her to write.

And you can definitely expect there to be exercises that help boost your bottom.

“My a** is definitely higher than it was when I was 20,” she told Access Hollywood in May. “This is the thing that people don’t understand — take care of your body [and it wil] get better! It gets better as I get older.”

Cameron’s outlook on getting older is:

“Look, the alternative to getting older is dead, so… I feel very fortunate to have a very full, loving, blessed life, so I’m living it to the fullest,” she said.

The book is slated to hit shelves in the fall of 2013.

Photo by FameFlynet