Ground Cable/Zip Line

[scary]

i don't nor do i condone it. But i meet a guy along time ago that bent rebar into to a little bit wider then a u shape and put a o ring in the middle and beat both sides into the ground and left just enough up just for the o ring to slide one enough rebar for the dog to run his circle. This was some years ago. They have yet to fail him. And he has had some BULLDOGS on it before. Like i said i don't recommend it or do I do it. But i have seen it done with success. BTW they were the inch round rebars and pretty deep in the ground as well.