Isn't Google amazing?
Correct me if I am wrong but isn't Greased Lightning the fun slide obstacle. We don't get it here in Tri-State but I have seen it at Pennsylvania. I would do this one like a child on a Slip N Slide because I saw people trying to stand on it in Penn and falling hard.
The exercise they're stating is shown here http://www.youtube.com/watch?v=4tuKi6C48N8. In terms of speed that will be how quickly you transfer from one foot to the other and distance is how far you leap laterally from side to side.
With that said this exercise will not help you in any way with the greased lightning obstacle because that obstacle is basically a slippy slide down a hill.
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