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The only thing I would add to what's already been posted is try to move backward without setting yourself up to trip and fall. I think bending at the knees and taking what I can only describe as "probing strides" backward (i.e. moving your foot and leg backward before you shift weight to them so if there is a curb, hole, drop off, you find it before you stumble). Maybe thats what george was saying below about dragging your feet. It's pretty awkward so it takes practice...

I agree with mr surveyor that the end results appear to be very effective.

Thanks for sharing a very cool video with us...