A simple technique (or combination of techniques) is as follows:
Reach out as far as you can and directly in front of your shoulders so that you achieve a straight arm reach. The final part of your reach should be just under the surface
Push back as far as you can so that you achieve a straight arm push back remembering, of course, that your arm recovery and most of your pull/push is more efficiently done with bent elbows
Roll your body to achieve a more effective and therefore longer reach and push back.