mistake
 

Thinking that crunches are the be-all and end-all of abs exercises

This is a common mistake.
A lot of people seeking out a six-pack tend to think that they can just crunch one out. No other exercises, just crunches.
Not true.
There are a plethora of exercises that are actually just as effective, if not more effective than the overused crunch.*
The dumbbell led abs moves outlined above target more of the muscles in that area than the crunch so change it up and inject some life into your six-pack workout.

Good post eazy, actually I never stick to just 1-2 exercises for any body part and I dont understand people who do it. It is always better to attack muscles with different exercises and from different angles.

Many need to learn that there are exercises for strength and exercises for shape.

Crunches are used more for strength, while leg raises are better for shaping.