First, place the noodle around your back, under your arms. Noodle ends should be pointing sideways. Lay on the back and rest your hands on the noodle. Keep both your legs straight, slightly below parallel.
Move both your knees together toward your abdominals as you bring your torso closer to them at the same time. Feel your lower and upper abdominal muscles in this move.
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
Think about squeezing your abdominals as you perform this exercise. Feel both your upper and lower abdominal muscles.