The best way to get abs is to combine intense cardio, abdominal stabilization and ab exercises. Additionally, remove all processed foods, refined sugars and alcohol from your diet.
Examples of an intense cardio workout include the following workout:
2 minutes jump rope, 1 minute high knees, 1 minute Heismans, 1 minute burpees, 2x 30 second sprints, 1 minute mountain climbers, 1 minute alternating leg curls with standing body weight rows. Repeat the circuit for 45 minutes to an hour. Add 15 minutes ab work- 2x 45 second planks, 20 crunches, 20 leg lifts, supine leg circles.
On some days, reduce the amount of cardio and do a Pilates routine you can find on YouTube, in addition to the aforementioned ab exercises. Look for variations on the plank. Planks work the deep abdominal muscles and are important for stabilizing the body.