From David Zinczenko, Men’s Health:
This routine is short and simple. In addition to 
performing this workout three times a week, train your largest muscle groups with classic moves like squats, bench presses, deadlifts and rows. And add the 12 Abs Diet power foods to your diet. The end result: you’ll lose fat, build muscle, flatten your stomach, and change your body forever.
This routine attacks your midsection from every angle, so your abs are constantly challenged. Choose one exercise from each section, for a total of five. Perform one move immediately after the other for the specified number of repetitions, then repeat the circuit. After four weeks, choose the exercise in each group that you didn’t perform in your previous workouts. His ensures that your muscles are always adapting to new stress.
Here’s the entire workout to burn off your belly.
