I have never felt that the free spinning keep was a good way to go. It just doesn't add up. I have a treadmill but have found that I only use it when working the dog at a slow pase( with the breaks applied) and have the dog hold a hide in mouth to help him breathe in hold. I also seen fat bill found away to work extra resistance training into spring pole work but using a core to hang a chain in a close by tree so that the dog working the spring pole has the resistance of the hanging chain work against. I started using this on my dogs while using a spring pole and have seen a huge improvement the outcome from the time spent spring poling.