Good post CJY. Many a well conditioned dog has been the result of hand walking and chain pulling. Personally, I believe the more work a dog will do with all four feet on the ground the better. If one can figure out a system or a game for the dog that causes him to sprint all out on his own over short distances, over and over again, the dog will only benefit. I have always tried to go pretty much... long walks/chain pulling/long walks....long walks/sprints/long walks....long walks....long walks/sprints/long walks....long walks/chains/ long walks...rest...rest...that is a basic five on two off approach. Figuring out what works for each individual dog is something all the great conditioners had in common and that is regardless of type of work being used. EWO