The cable crunch is another classic ab move. Kneel below a high pulley that contains a rope attachment. Grasp cable rope attachment and lower the rope until your hands are placed next to your face.
Flex your hips slightly and allow the weight to hyperextend the lower back. With the hips stationary, flex the waist as you contract the abs so that the elbows travel toward the middle of the thighs.
Exhale as you perform this portion of the movement and hold the contraction for a second.
Slowly return to the starting position as you inhale.