Instead of going straight into the ab workout your going to be doing some moderate to intense cardio before hand. The reason for this is to really help with additional weight loss. To see your abdominal muscles you need to have a low body fat and little fat around the stomach area.

Incline treadmill sprints:

5 sets of 30 second sprint x 30 second slow jog recovery

Cross trainer:

10 minutes at a moderate to intense pace

Box jumps:

5 sets of 20 box jumps

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Ab circuit

Hanging leg raises:

3 sets of 15-20 reps

Medicine ball sit ups:

3 sets of 20-30 reps

Crunches:

3 sets of 30-50 reps

Double crunch:

3 sets of 20-30 reps