in my opinion, it's a great way to train and give your dogs exercise when it's too hot to actually hunt.
If you want to exercise them, then talk them for a jog. They will far more exercise do that then baying in a pen.
I dont know about that. Have you ever been in great shape like 12 minute 2-mile shape then try and run a 3/4 of a mile in a intense/stessful sitiation. You feel like your heart is going to explode.