Chris Ward backside surfing.
Chris Ward's backside surfing, available on YOU TUBE/LOST TV.
This video was filmed with realistic waves about chest-sized, and is a great example for Japanese surfers, so be sure to check it out.
He connects maneuvers in one turn without any unnecessary board movement on the backside.
When going from the bottom to the top, the lead of swinging your left arm up from under you causes the board to rise vertically, and this movement is very helpful as it repeats in the same way.
It's also helpful to note that when you reach the top, you turn your head down, which also causes the board to turn higher than your body.
By doing rail work like this, you can get deep from the bottom and rise to the top, allowing you to surf a long line without any wasted line. If you're not good at backside surfing, be sure to try this out.