Cameron Diaz: Big Apple Fitness Fiend

The always active Cameron Diaz was spotted heading to an afternoon workout on Monday (August 27) in New York City.

Looking energetic and ready for her sweat session, the 39-year-old donned a red tank with black yoga pants as she excitedly walked down the Big Apple streets.

In fitness related news, the blonde beauty is set to write a book about health and wellness in partnership with HarperCollins.

According to the publisher, the book will offer advice to young women about health, fitness, nutrition and general well-being. A rep for HarperCollins says Miss Diaz hopes to "engage and empower" women.

Enjoy the pictures of Cameron Diaz heading to an afternoon workout in New York City (August 27).