For this exercise, you will assume the supine position with your hands placed beneath your hips for support [to increase the difficulty, you can either place them out at your sides or behind the head], feet 6 inches off the ground, legs straight, head up off the ground.  You will then "flutter" your feet, keeping your legs straight at all times.  Proper form also calls for pointing of the toes.

*This exercise is typically done by the 4-count.  [This means: say you start off with the left foot--raising it will be "1".  Then, when you replace it with the right, that's "2".  Left again = "3", then right foot = "4".  Each set of 4 equals one repetition.  Example count-off: "one-two-three-ONE, one-two-three-TWO, one-two-three-FOUR" and so forth.