
WKKKChan has an interesting lesson on his site about grabbing the rail. He writes….
To help you Turn, Hold a line, Lift the outside rail, or just make the board more stable, a surfer can GRAB RAIL.
If the wave is too fast, too step, if you are too light or too much in the center of your board, grabbing rail can help you turn.
How important is this in your surfing bag of tricks? As a small guy on a long board I’m thinking about doing more of this because there are times when I lean for a trim or step back for a carve and nothing happens!

http://alohaki.jugem.jp/