In the deep-end, place the noodle under your arms. Let noodle ends point sideways. Lay on the back and rest your hands on the noodle. Keep both your legs straight, slightly below parallel.
Bring your knees and your torso closer together. Squeeze your abs if you can.
Breathing order is very important when you perform this exercise. Inhale as you lean your torso back. Exhale as you bring your torso up, toward your knees. Don't do this exercise too fast and always give yourself enough time to breathe
Use your upper abs to lean your torso and your lower abs to bend your legs.