Lie on the floor/mat on your back. Keep lower back in contact with the floor, feet and legs straight and together. Place hands to sides or under lower back for support.
Keeping legs straight and together, back flat, lift legs upward until they are straight above hips. Lower down to starting position slowly and with control (but do not allow feet to touch the ground between reps) to complete one rep.
Make sure back stays flat on floor and abs are tight (pull navel in towards spine).
Muscles Worked: Abs, hips