When Lucy pitches a promotional campaign in which gorgeous fitness-trainer Theo will take a 'fitness-challenged' woman and turn her from flabby to fabulous, she isn't planning on being the star. But then again, for every pound she loses on-screen, she gains big bucks. And as Lucy sweats her way into a whole new life, things start to heat up between her and Theo - but what can a chocoholic and a gym bunny possibly have in common?