I am guilty of still doing AB exercises to make mine pop. I have an inversion table and I invert daily. A couple times every week I have a workout that I do while I am inverted. I started off just doing inverted situps and inverted crossover crunches and I've gotten to the point to where I need weights (dumbbells are what I use) for the inverted situps. My upper abs have been visible for a long time but they are bulgier looking now.