I found this on YouTube. BTW, the same author has videos on other kicks also.
YouTube - The Back Kick
Ben
YouTube - The Back Kick
Ben
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I'm not sure I would put much faith in those videos -- they are subpar in showing correct technique. For example, in the back kick video, the diver drops their knees almost the entire time. In the Helicopter Turn video they are essentially 'slinging' themselves side to side.
There is Andrew Georgitsis demonstration quality, and then there is how real people dive . . .
Yeah, unfortunately, I did three weekends of work with Andrew and never really got to see him dive. He was always above and behind me, and above to wreak havoc . . .
There not all that bad, a wee bit over exaggerated yes......no amateur video is going to be perfect.
Here is an idea....you are GUE/DIR and all....demonstrate this in a new video of yourself preforming it as you think it is to be done and provide it to all those wishing to learn from an expert.
TSandM:Sparticle, I think you are way overcritical. The knee dropping in the back kick is minimal; the subject's frog kick is exemplary, and the helicopter turn is not at all bad.
I have been trying it, and improving with some success. But it is very hard. I find myself going upward more than backward.