The spring pole is a great tool for conditioning. But I'd say as far as in a keep one that should be used very carefully. Early on if you keep your feet on the ground and let the dog mouth it, it is good for wind sprints.

As the dog gets more in shape it will be hard to be faster than the dog, the dog is very enthusiastic and could injure itself which would defeat your purpose. Also if the dog gets the hide, you'll be needing a tool to remove him from it, risking mouth injury.

So early on yes, as the keep advances no imo.

S_B