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I have been trying it, and improving with some success. But it is very hard. I find myself going upward more than backward.
there is another way to go backward...sculling
as far as I have seen no one teaches it this way. you basically turn your ankle to 90degrees (ie straight down, assuming you are horizontal) and then scull in and out. its take practice but you can figure out how to position the blades to angle you forward or backward. once you learn it, its far easier and faster than the "reverse frog kick" that most people try to teach.
I have been trying it, and improving with some success. But it is very hard. I find myself going upward more than backward.