As you probably know doing just ab workouts will not make you flat stomach. Cardio and diet are necessary as well to burn the fat covering your ab muscles.
Usually we do cardio and ab workouts separately. But why wouldn't we mix them up?
The routine below is a good example how you can combine cardio exercises with abdominal workout.
This routine will help to reduce stomach fat and at the same time tone and strengthen the ab muscles.
The details of the workout:
Time: 30-second sets
Rest: No rest