I wish this could be caught on video. I think Ripley has an inherent agility course-running proclivity. At least once a day, sometime in the morning, she does laps as if she's competing in the 400m. But she is not content to run around and around in a plain old boring oval. At work she does top-speed loops of the enclosed back yard that include detours under the picnic table and through the porch posts and around the trees. In my office (a much smaller area) she goes just as fast around my desk chair, behind the desk, and around the room. This morning at home (while I was watching footage of the opening ceremonies, no less) she invented a course that went around the coffee table, behind the futon, through the kitchen, and back into the living room. She repeats the same course for almost every lap. Tomorrow morning I'll try to count how many laps she does and report back.
Now that she's worn herself out maybe I should go for a run myself.