I've decided to try to learn the breast stroke, which I've never even attempted before. Right from the get-go, I am having a problem. I don't seem to understand how to do the "rotation" in this stroke. According to my understanding of the video, the "rod" (in freestyle that would be from top of head down the length of my body) I rotate on, should be through the center horizontally. But I can't seem to do this at all. Is there a different way of describing this 'undulation' so that maybe I could figure it out?