I'm not sure about BGOs or ALOs as we are new to this process as well, but the application provides these instructions in the Recommendations section:
#4 - A sports coach, physical education instructor, or active duty military member who will administer and submit results from your Physical Fitness Examination; contact your Admissions Officer for alternates if one of these individuals is not available. Provide this individual the PFE Manual, available in the "Downloadable Forms" section, in advance so they are prepared to administer your exam.