I guess I should rephrase. I take Rock the Wonder Mutt , on a bike trail by my house for about a mile or two, and go to a field that runs along the trail. I let him hunt that for about 20 minutes, or he feels he has it covered, and then we go for a little ride again. A couple times a week I bring him to the Zumbro river by my house for some retreives against the current. That is the best workout he can get, and I cannot get him to stop. he just wants to keep going.
Then when he is a little tired, and I have a few extra minutes, we do some hardcore training in the yard on the retrieves (blind retreives, taking lines, etc. etc.) Seems like the best time to do it is when he is a little tired.
You are 100% correct that the hardcore “road” work is not good for the dog, but I think I need that to get my butt in shape. I much prefer to work the dog in a training environment while getting him in shape, but what good does a dog do that can hunt all day, if I can’t