As the guys said...
If you want abs, you need to remove the fat that covers your muscles. You can achieve it with diet.
But, you should train your abs too. Train it like any other muscle... with intensity and recover between days.
You don't press a 20kg barbell everyday for 200 reps to get pecks... so... same logic with abs.
Train it 2x a week, sets with 12-20 reps... quality in muscle contraction in each repetition and try to reach failure or almost failure in every set.
As time goes by as it gets easier and lighter, you add weight... and the weight always positioned as far as possible from the driving axis of the movement, increasing the tension in the worked muscle.
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