1. Lie down on your back, facing up.
  2. Place both your hands underneath your buttocks.
  3. Keep your lower back on the ground as you lift the right leg off the ground slightly past hip height, and lift the left leg so it hovers a few inches off the floor.
  4. Hold for 2 seconds, then switch the position of the legs, making a flutter kick motion.
  5. For more of a challenge, lift your head and neck off the floor.
  6. Repeat this motion for up to 30 seconds.