Brandon Miller has set the national 800 and 1500 record since he was 10. Thing is, he has never run XC or indoor. Extremely low mileage when he does run outdoor. Plays basketball in the winter and football in the fall. The talk coming out of St Louis a couple years ago was that track isn't even his best sport.
My kids have followed and enjoyed his development over the years. His progress actually inspires them even though they know that there is no amount of training that they can do that will allow them to run anything close to Miller's times.
Event 78 Boys 1500 Meter Run 10 years old
National 4:49.53 7/31/2012 Brandon Miller - O Fallon, MO
Event 79 Girls 1500 Meter Run 11 years old
National 4:45.65 8/3/2010 Daesha Rogers - Miami, FL
Event 80 Boys 1500 Meter Run 11 years old
National 4:37.24 7/30/2013 Brandon Miller - O Fallon, MO
Event 81 Girls 1500 Meter Run 12 years old
National 4:41.14 8/3/2010 Danae Rivers - Derby, CT
Event 82 Boys 1500 Meter Run 12 years old
National 4:22.84 7/29/2014 Brandon Miller - O Fallon, MO
Event 83 Girls 1500 Meter Run 13 years old
National 4:36.79 8/2/2012 Daesha Rogers - Miami, FL
Event 84 Boys 1500 Meter Run 13 years old
National 4:13.45 8/4/2015 Brandon Miller - O Fallon, MO
Event 85 Girls 1500 Meter Run 14 years old
National 4:34.1h 1986 Melissa Benner - Norristown, PA
Event 86 Boys 1500 Meter Run 14 years old
National 4:02.09 8/2/2016 Brandon MIller - O Fallon, MO\
Event 60 Boys 800 Meter Run 10 years old
National 2:18.52 8/1/2012 Brandon Miller - O Fallon, MO
Event 61 Girls 800 Meter Run 11 years old
National 2:19.27 2000 Quantikia Stepney - Baltimore, MD
Event 62 Boys 800 Meter Run 11 years old
National 2:11.98 7/31/2013 Brandon Miller - O Fallon, MO
Event 63 Girls 800 Meter Run 12 years old
National 2:13.30 8/3/2011 Daesha Rogers - Miami, FL
Event 64 Boys 800 Meter Run 12 years old
National 2:03.09 7/30/2014 Brandon Miller - O Fallon, MO
Event 65 Girls 800 Meter Run 13 years old
National 2:07.65 8/1/2012 Daesha Rogers - Miami Gardens, FL
Event 66 Boys 800 Meter Run 13 years old
National 1:56.41 8/5/2015 Brandon Miller - O Fallon, MO
Event 67 Girls 800 Meter Run 14 years old
National 2:08.15 7/31/2013 Daesha Rogers - Miami, FL
Event 68 Boys 800 Meter Run 14 years old
National 1:51.23 8/3/2016 Brandon Miller - O Fallon, MO
Event 69 Girls 800 Meter Run 15-16 years old
National 2:07.08 8/5/2009 Ajee Wilson - Neptune, NJ
http://image2.aausports.org/sports/athletics/results/2016/jogames/2015jogamesrecords.pdf