Get your walk on
So, there are two types of walks we take with our dogs. One is the on leash walk, very important, good mental stimulus, time for training, learning to walk nicely on leash. Then there is the exercise walk, off leash, ripping and tearing around for the sheer joy of stretching your legs. Exercise is very important for dogs, even if they get two nice on leash walks, dogs have to get off leash to make it really count. That is; unless you are a runner or use a bicycle hookup or something like that.
Dogs who are never given the chance to run are really lacking in the muscle department. Running in an open field or at a park going in circles, deeking and diving, going after a ball etc uses different muscles than the just walking muscles. Dogs who are more muscled will fair better as they start to age and lose muscle due to the aging process. So using those muscles will help protect joints and keep everything nice and limber.
The old saying "a tired dog is a good dog," is very true, to a point. Sometimes a dog is too tired, maybe had too much stimulation or exercise so more is not always better when talking about exercising our canines. With all of the dog parks popping up many people pull up to the park, let the dogs go and sit and chat for hours at a time. A single hour at the dog park is a very long time to socialize and exercise for a dog. They can become over stimulated and exhausted. So short and sweet is the key to power exercising at the park. If the park is filled with powerhouse runners then let your pooch get out their ya ya's and then head for home.