Cable crunches are a great way to increase your abdominal strength and break through strength plateaus.
If you've been slaving away doing crunches on the floor and have hit a strength plateau, then adding cable crunches to your routine might be able to help you break that plateau.
 
There are many ways to add resistance to your abdominals and the cables are just one way.
 

Double crunches are a great stomach exercise.
 
They work both the upper and lower portions of the stomach at the same time. The can't magically get rid of stomach fat, but they are great for strengthening the upper and lower abs.
Visit Ab-Core-and-Stomach-Exercises.com to learn all the best stomach exercsises.
 

Want to learn the best stomach exercises?

Visit Ab-Core-and-Stomach-Exercises.com to learn the best stomach exercises and get stomach workout tips.

You can learn stomach exercises on the ball and exercises for your stomach on the floor.

Also read my article on the evolution of stomach exercises, sit ups versus crunches.

If you are looking for some new stomach exercises, check out Ab-Core-and-Stomach-Exercises.com.
You can learn over 100 stomach exercises for free.  Learn tons of exercises on the floor and tons of exercises using fitness equipment.
It has pictures of stomach exercises on a ball, and has free workouts for your stomach.
 

If you want to learn all the best abdominal exercises, check out ab-core-and-stomach-exercises.com.  It has pictures and instructions for more than 100 abdominal exercises, as well as tips to lose weight and get a flat stomach.

If you want your abs to really burn try these killer ab exercises.
 
You can use 2 Bosu Balls to do planks.  Place your elbows on on Bosu Ball and your feet on another Bosu Ball and hold the plank position.  If you want a greater challenge, try lifting one leg off the Bosu Ball.
 

You can use cables to do many different ab exercises that really work the obliques.
Cables allow you to twist and rotate in ways that traditional ab machines cannot.  If you don't have access to a cable machine no worries, there are many other ways to work your oblique muscles.

If you've been doing regular ab crunches on the floor, maybe it's time to try doing your crunches on an incline.
 

The other day I added pictures of a few new ab exercises on a bosu ball.  They were Bosu Ball Crunches with the feet up, Bosu Ball Oblique crunches with the feet up, and Bosu Ball bicycle crunches.

Dumbbells can be used to work your abs.  Actually, you can use any type of weight to add some resistance to your abdominals.  You could also use medicine balls or weighted plates.
 
Some simple dumbbell exercises for the abs are weighted crunches, weighted russian twists, or dumbbell side bends.