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Using a wall will help you isolate the pelvis and focus on building comfort and strength with this motion. In addition, the wall will keep your arms and shoulders in line, similar to the position you will want to maintain in the water. Stand with your upper back against the wall and your feet twelve to eighteen inches from the wall. Hold your arms above your head in streamline position. Tilt your pelvis backward by slowly crunching your abdomen in. Bring your middle and lower back slowly in contact with the wall as you do this. Then, reverse the motions. Repeat up to five times. Turn around and stand with your feet about eighteen inches from the wall. Keeping your pelvis above your feet, hold your arms above your head in streamline position and rest them on the wall. Rotating your pelvis forward, slowly bring the rest of your torso and then your thighs into contact with the wall. Reverse these motions and repeat up to five times. Hold the kickboard level in front of you. Extend your arms instead and keep your head up. Do not "pump" the kickboard, but maintain an even, level position, keeping your arms and your shoulders in a steady plane. Imagine you are leaning against a wall in order to keep your torso and arms still; the motion should come from your pelvis and legs. When you feel comfortable with this drill, try the same thing without the kickboard. You may also practice this drill in deep water to build the necessary amplitude. Push off from the wall at the surface and oriented on one side. Extend the bottom arm in front of you and stretch the other arm along the top of your body. Stay in the middle of the lane. This drill helps to develop the symmetry required of the stroke. The dolphin kick can help you develop a faster stroke rate. Match one stroke with each kick for a short distance in this drill, not pausing to breathe.
Practice pelvic rotation against a wall outside of the pool. Try the kick using a kickboard. Practice the kick on your side. Use the dolphin kick with freestyle arms to increase stroke rate.