Abs should be trained like any other muscle group. You do not have to have marathon workouts or even daily sessions for impressive looking ab's. Two or three times a week, with 3 sets or 8 to 15 reps. Abs are a very strong, short ranged muscle group, so be encouraged to add weight to any exercise you do for them. If your a lifter you will understand the importance of strong abs. Abs are most impressive when the ridges of pure muscle are developed and show clearly.And as suggested, if you tend to have a layer of fat covering those abs, than adjustments to the diet may be a good choice. Even with cardio a good selection, when eating, can be key to impressive abs. Good Luck.
