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Herrmann (Stephen.Herrmann@SanfordHealth.org) and Pfeiffer (kap@msu.edu) are Guest Editors for this supplemental issue of the Journal of Physical Activity and Health. Herrmann is with the Children’s Health Research Center, Sanford Research, Sioux Falls, SD. Pfeiffer is with the Dept of Kinesiology, Michigan State University, East Lansing, MI.