I read a Frederic Delavier’s book « Strength Training Anatomy » and I learned good stuff.
Your legs are on a bench with your back to the floor and your hands behind your head :
Inhale and raise your torso as high as possible to touch your knees with your head by rounding your spine.
Exhale at the end of the movement.
This exercise works recuts abdominis and more intensely the parts above the navel.
It’s good to know that farther is your torso from the bench, this increases the mobility of the pelvis. This allows a greater range of motion and works more flexors muscles of the hips (iliopsoas, rectus femoris and tensor fasciae latae).
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