Think of a person who is not interested in bodybuilding and fitness.
Let's say that he didn't change anything in his lifestyle (still no fitness, no diet, no cardio) but only started to do abs workouts regularly. What will be the results; can you achieve a visible sixpack? What are the visible changes?
Edit: After 2 answers received, I want to make my point more clear: I need to know if abs workout alone helps fat burning. Is it possible to burn all the fat by just abs?