Performing the: A Step-by-Step Tutorial Oblique Crunch
Rotate your legs to one side, keeping your upper body straight, so that your lower body is on its side.
Place your hands behind your head or on your temples, making sure not to pull on your neck as you perform the exercise.
Slowly lift your upper body off the ground using your oblique muscles, crunching towards your hips.
Lower yourself back down to the starting position slowly, then repeat the crunch on the same side for the desired number of reps before switching to the other side.