If you're ready to build your ab muscles so they're visible even at a slightly higher body fat level, this is the workout. With hanging leg raises and a weighted superset, you'll be feeling your core right out of the gate. Finishing with a round of kneeling cable crunches, you'll leave the gym afraid to cough or laugh. 

Hard and Heavy Ab Workout
Hanging leg raise
3 sets, 15 reps (rest 90 sec. )
Perform the exercises in order, resting as little as possible between exercises and 1 min. between sets.
Lying Windshield Wipers
4 sets, 10 reps (no rest)
Decline Weighted Sit-Up
4 sets, 12 reps (rest 1 min. )
Kneeling cable crunch
3 sets, 15 reps (rest 90 sec. )
Ab Workout Abs