I love having my dogs able to run and exercise off-leash whenever possible. It depends on the dog - I have two (one is nearly 15, and one is a lazy nine) who do great with minimal exercise. But then there's the 22 month old, and the ten year old shepherd who both have a need to run. Getting them out and letting them move freely is good for them, both physically and mentally.
As for that whole "walk the dog behind you" nonsense .. *L* .. it's not necessary if you have established yourself properly as the leader in other ways. My dogs are very bonded to me and have an extreme amount of respect for me, but I have no need to make them walk behind me. To base leadership on that one thing borders on ridiculous.
My dogs can be running off-leash freely and I can call them to me and have them respond quickly and reliably under most distractions. That may sound simple, but three of my dogs are chows and that is NOT the easiest breed to train. But between the three of them they have five obedience titles, six agility titles, one rally title (on the youngster), a herding certification, a schutzhund BH and a pet therapy dog certification. You don't accomplish these things through lack of leadership, but I have never had to make my dogs walk behind me in order to get them to understand who is the leader.
Millan is vastly over-rated, but it seems it has a cult following in people who don't understand how little he knows about dog behavior. It's always interesting to me to see how much they miss in his programs .. the force that he uses, the aversive methods and the complete lack of concern about the dog at times. The only things that he promotes that carries any true credibility are that you need to exercise your dog and you need to provide a strong leadership. His means, however, mostly do not justify the end.
Melanie and the gang in Alaska
... someone who HAS written a book that was carried nationally and sold internationally .. *L* ..