Bren writes in to point out the following article from Haydn Wooley on www.xtri.com.
"The most fundamental skill in the water which is taught immediately after floating, is that of streamline - tightly locking your arms around your ears to cut water into clean lines around your body."
"Most swimmers with a reasonable level of flexibility plus some commitment will learn this skill quite easily. But to really utilise this fully, you must learn to integrate streamline into another skill that allows you to bypass the biggest of time-wasters - putting your hands on the wall when turning. So through the following sequence you are going to learn how to Tumble Turn..."