We all want a toned, flat stomach. No surprise there. But since many men & women are still relying on crunches to get it, we want to make one thing clear: Crunching is not the most effective abs workout. "Crunches work only the muscles on the front and sides of your abdomen, but it's important to target all the muscles of the core to get more defined abs—including lower back, hips, and upper thighs.
If you think doing crunches, crunches, and more crunches is the best way to build your abs, prepare to be enlightened. What you will discover is the most effective way to train your abs from every single angle while burning off the fat that hides them.
In Core Fitness Club abs exercise is more challenging than a traditional plank because you're supporting your entire body weight on two points of contact instead of four. As a result, you must work your core harder to stay stabilized.