Armed with a New Year's resolution and a surly attitude matched only by a cat on a diet, Erica Sutton decides to reshape her life. Little did she know that signing up for a personal trainer meant the gym's owner, Zack Sharp, would become her new workout whisperer. If she's not careful, she won't just be shedding pounds; she'll be gaining something she never bargained for-feelings for the man who keeps insisting cardio is good for her.

But hold the protein shake! A specter from Zack's past, an ex-lover as jealous as a pineapple eyeing pizza, notices their budding relationship and sets out to remove the competition by any means necessary.

As the love handles begin to shrink, so does Erica's peace of mind. Now, she's holed up with Zack, debating the merits of donuts, carnal desires, and Cupid while their crazed stalker sets out to light their world, quite literally, on fire. If they can't dodge the danger faster than Erica avoids sit-ups, their sizzling connection might go up in smoke.