How To Get 6 Pack Abs.

I've made this as my first post because its probably the most asked question, yet the least understood. Let me make this clear before continuing. Abs are made in the kitchen, not at the gym.

Now that we've got that sorted let me explain. A visible abdomen is only visible through a low body fat content. Period. You can have a core with the strength of a horse, but you're abdomen will be invisible when covered in a layer of fat. Everyone has a "6 pack", but their definition is down to factors:
Body Fat (The most important)
Muscle mass

In order to get visible abs you must shed body fat, no exceptions. Doing sit ups, crunches and over isolation movements for your core won't make them any more visible.

So How Do You Lose That Extra Bit Of Fat?
I'm not going to say its easy, but there are several methods. If you read following posts I'll discuss several proven fat loss methods, but put simply, eat less. If anything, eat less carbohydrates. But more on that later. Importantly, don't starve yourself, it will only diminish muscle definition as the body will see it as "free" energy

What Sort Of Exercises Should I Do?
The sort of exercises you do, is solely up to what you have at your disposal. The most effective are weighted Squats, heavy Dead lifts and Bent Over Rows. They will heavily work your core, and build muscle mass in multiple areas of your body.

Situps are ineffective, the driving force of the movement is in the hips, not the abdomen, Squats and Dead lifts are excellent as they use multiple areas of the body to drive the movement, the core, and abdomen especially.
Crunches isolate the core and good for building resistance. Unless the crunches are weighted and the number of reps performed are between the 5 - 12 range, you'll have trouble noticing definition. Resistance doesn't build mass, its that simple, all you'll have in the end is being good at crunches.

In conclusion, to get 6 pack abs you only need to lose body fat. Squats and Dead Lifts will strengthen the muscles that support the abdomen as well as work the targeted area more effectively than situps and crunches.