* Since you abs are stabilizer muscles, they will get worked extremely hard on exercises like squats, deadlifts, and seated dumbbell military presses. (The trouble is, the majority of guys want nothing to do with these tough lifts.)
* Forget about the "More is Better" philosophy. Doing an extra 500 crunches each day will NOT help you get ab definition any quicker. You CANNOT "spot reduce" and you will NEVER burn enough calories.
* Adding interval training workouts is a MUST if you are sincere about getting defined abs. This is how athletes train and why they look so ripped.
As you can see, the best ab workout is actually a comprehensive program of conscious eating and focused, intense workouts.