Organized by Club Northwest, a locally based running club, the events all use the same 5K course as the baseline route from which all the other events are built upon. Those running the 5K on the day of the race, for example, run the route a single time, while those running the 10K run it twice, those running the 15k run it three times, and those running the half marathon make four loops around the course, plus an additional one-kilometer stretch near the start & finish.
(MORE: Magnuson Series Summer Fitness Day Half Marathon event details)