Instead of thinking your dog needs to be trained to learn how to behave appropriately, which is true, however your dog should be tired enough that he needs to rest.
Physical exercise is important for active dogs, your job is to ensure your dog has the appropriate output during their day so that when it's time to rest, they rest.
Being bored is a good thing for a dog to learn to experience. To wait and relax, ready for another day of activity.
