Exercise is the  most important thing you can do for your dog.

Firstly, it keeps them healthy.

An exercised dog is a more relaxed and calm dog, and is less likely to be destructive and aggressive.

They are much easier to train when they have exercised and are calm.

A dog needs at the very least a 30 minute walk every day.

  We see this in our own dogs ( Springer spaniels). They get 2 walks a day in all weathers, a full hour and later on in the day 45 minutes. Because of this they are calm, obedient and a joy to live with.

It is a well known fact, that most problems that dogs have i.e. aggression, destructive, disobedience etc, is through lack of regular exercise.