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Power Crunches Build Chiseled Obliques

Power Crunches Build Chiseled Obliques

For a really impressive midsection, you need not only chiseled abs but also carved-out external obliques (the muscle fibers that run diagonally downward from your sides). An exercise that we recommend might surprise you: the crunch. To hit the obliques, you must crunch with a lot of speed. These are what FLEX calls power crunches.

One study found that crunches done explosively used more oblique muscle fibers. To do power crunches, lie on your back with your feet flat
 on the floor and knees bent. Crunch up as quickly and explosively as possible using your abs and obliques and return to the floor in a slow, controlled manner.

Alternatives: medicine ball crunches, machine crunches, cable crunches.

When to Speed Up

The best time to do power crunches is at the start of your ab workout, when the ab and oblique muscles have the most power. Just like with other power exercises, such as jump squats, if you are fatigued, the muscles will not be able to generate enough power to do the exercises as quickly and explosively as needed.

Form and Function

The diagonal muscle fibers of the obliques run from the lower 
ribs near your back to the front part of your hip bone. Separately, they work to flex your spine to the left and right, as during oblique crunches, when you bring your shoulder toward the same side hip.

Power Crunches Build Chiseled Obliques

They also initiate the twisting motion of your torso during twisting crunches, where your shoulder nears the opposite hip. When the left and right obliques work together, they help to flex the spine forward, such as during crunches and leg raises.

Authors: Greg Merritt & Jim Stoppani, Ph.D


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