Training the abdominal muscles has recently been the subject of more misinformation and mythology than any other part of the human anatomy. Gizmos and gadgets allege that they'll give you those coveted "six-pack" abs. But here's how you can rationally train your abs to their absolute maximum limit of development using everyday gym equipment. There is nothing unique about abdominal muscles as far as their training and response to training is concerned.

 To force new development, you need to increase the intensity. You could add a few crunches every day, but that really just increases duration; there is a better way to get fast results.
 Abs exercises proven to work
 1- Weighted crunches
 2- Weighted incline sit-ups
 3- Weighted sit-ups
  The best way to do weighted crunches is to lie on the floor with your head close to the low pulley weight stack. Using the rope handle attachment, grasp the ends and pull the cable until it is tight and your hands are resting at the side of your head near your ears. Now contract your ab muscles in a crunch that lifts your shoulders off the floor and draws the weight stack up an inch or two. Choose a weight that is so heavy, you can only do 8 to 12 reps.