I have a travel one with a chain I bring and attach stuff to cause I don't have tree with big branches in my yard. We take it in the woods and stuff. But if you don't have money to get the stuff I use Ropes (folded, not the kind that has a fake handle that can detach after 5 seconds)
They are no spring pole, and pretty ghetto but they get him active and he loves them. This is a clothes line behind my shed. The problem I had with this is he would climb the fence and get bangs on his knee. I made it real low now so he has all 4's on the ground.
This is just a random stick I put the rope over. Saves my back a little and lets him really tug.