Will doing Ab crunches give me a Six pack?

In a word, NO!  If only it was that simple.  There is an old saying, Abs are made in the kitchen, not in the Gym.   We all have Abs, some are just more hidden under a layer of fat than others.  To get Abs you need to eat the right things and train hard to reduce your body fat.  Before you know it, those beautiful things will be there for all to see!  You need to work the Abs from different angles to get the defined six pack. So even if you have low body fat you need to do a lot more than crunches!