Pitbull Hanging tug toy?

I've seen this apparatus where there is a rope or something similar hanging down from a tree/roof/stand, and the dog can hang on and pull and swing around.

Is this good for the dog? My suzie likes to play tug until the cows come home, sometimes we've anchored a rope on a support beam in our house and she's played all by herself!

Does anyone do this??

Yup, they are called springpoles. Dogs love them!!!!
Here is a link to information about them:
http://www.workingpitbull.com/springpole.htm

My bulldog loves that! Last night I tied his favorite tug toy to the handle of one of our doors, and he just tugged with the door by himself!!