Watch the video below to see a demonstration of proper form and technique for the oblique crunch exercise. You can also check out some more abs exercise videos or find exercises for other muscle groups.
To perform a set of oblique crunch:
Lie supine on a mat with your knees bent, feet on the ground and left hand beside your ear. The trunk should be in a neutral position.
Squeeze your abdominals to raise your left shoulder and head off the ground until your shoulder blade lose contact with the mat. It is important to breathe normally and maintain a neutral lower back position throughout the entire movement.
Pause at the top position for a 1sec count while squeezing your abdominals.
Lower your shoulder and head back to the ground without losing the neutral postion of your lower back. Remember to breathe normally throughout the entire movement.
Repeat steps 1 through 4 until you have completed the desired number of oblique crunch repetitions for each side before resting.
This completes one set of oblique crunch.