what is the best workout to do in order to get a six-pack.?

Question

p.s. i am not fat either

Answer 1

cardio - you have to have really low body fat percentage to have six pack visible.
do crunches, leg lifts, side bends etc (there are so many ab workouts) 3 times a week (every other day), 15-25 reps, 2-4sets (muscle grows in between workouts while you rest)
do ab workouts before cardio.
drink lots of water

Answer 2

strict diet and lots of cardio. for people who compete they say 80% is diet.