Performing the: A Step-by-Step Tutorial Twisting Crunch
Place your hands behind your head, making sure not to pull on your neck when performing the exercise.
Now, lift your upper body, performing a regular crunch.
As you reach the peak of the crunch, twist your torso to the right, bringing your left elbow towards your right knee.
Lower yourself back down to the starting position, and then repeat the motion, but this time twisting to the left, bringing your right elbow towards your left knee.