Having a doggy is a big responsibility and you have to walk it at least 3 times a day.

Besides walks remember that a dog is an active animal which in the wild would hunt, so it needs a certain amount of activity each day to keep it healthy and happy. This is even more important if the dog lives with you in a small space.

Just because your dog needs exercise doesn't mean that you have to get bored walking it all the time. You can do exercise with your dog. 

Walk your dog each day for a half hour which will be good for you both. On the weekend, try to get your parents to take you and your dog to the beach, mountain or park for more diverse exercise and a run in the fresh air. 

Here's a funny video for you about dogs that do exercise with their owners.