We probably walk a few times a week, but Mojo is out in the yard playing hard everyday. I think if he didn't get to run everyday, he'd literally be bouncing off the walls.
Now if we could just get it to stop raining here, I'd probably walk him everyday.
We play fetch a few times a day and run around with him in the backyard. He's very high energy, but when he gets his exercise, he is extremely well behaved.