I work my core 3 times a week. However, it's with the idea that those movements are to strengthen my core. With that said your abs aren't going to show unless you lose a sufficient amount of bodyfat. How good your abs look will depend on your diet, genetics and to a small extent your core workouts. I don't do crunches. Never have and I never will. I do planks, locamotives (something I took from a P90X routine) hanging leg lifts, hyperextensions and twists. Once again it is a core workout and I never work my core any more than mon/wed/fri which takes no more than about 20 minutes.
If you have never done a plank try 5-10 sets each for 20 seconds. It'll change your idea of a core workout forever.
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