Cable Leg Raise:

Lay down on a mat next to a low pulley station in a position to do a regular leg raise on the floor. Put an attachment on the pulley that you can move with your feet or knees. Keep your arms by your sides. Lay on the mat. Bring your knees towards your chest, going past your hips, like a regular floor leg raise, with the attachment attached to your feet or knees. Squeeze your abs in the top position and exhale.

Slowly lower your feet back towards the ground. Stopping just before the bottom. Inhale. Repeat for reps. Avoid using momentum to do the exercise.