Attach cable ankle straps to both ankles, then attach ankle straps to cable. Lie supine on floor or mat, back far enough so cable is taut. Grasp support behind head.
Raise legs by flexing hips and knees until thighs are just past perpendicular to torso or before hips raise off of bench. Return until hips and knees are extended. Repeat.
Exercise can be performed on bench. Rectus Abdominis and Obliques only contract dynamically if actual waist flexion occurs. With no waist flexion, Rectus Abdominis and External Oblique will only act to stabilize pelvis and waist during hip flexion. It may be necessary to completely flex hips before waist flexion is possible; see Cable Lying Leg-Hip Raise. Knees may be kept extended throughout leg raise to increase intensity; see Cable Lying Straight Leg Raise. Also see Spot Reduction Myth and Lower Ab Myth.