Exercise is important for dogs, but the idea that every behavior problem can be fixed by simply exhausting the dog is misleading.
Energy isn't the only variable
A dog can run for an hour and still jump on visitors. Another dog can be physically tired but remain anxious around strangers.
Behavior is influenced by learning history, reinforcement, emotional state, environment, genetics, and many other factors.
Combine physical and mental activity
Walks, play, sniffing, training games, food puzzles, and appropriate social interaction can all contribute to a balanced routine.
Short training sessions can also provide useful mental work without requiring endless physical exercise.
Be careful with the escalation trap
Trying to solve every problem by increasing exercise can create a dog who needs increasingly intense activity just to settle normally.
Exercise should meet your dog's physical needs, not become a substitute for teaching the behaviors and coping skills you actually want.
The best routine usually combines appropriate physical activity with opportunities to explore, think, learn, and rest.
