Ran a 7:08 at the beginning of 7th grade with the lifestyle of a couch potato. No running training, soccer training, jogging from home to school training, etc. I lost to several girls, so I started training. It wasn't much, just 12-15MPW, but I was able to run a sub 6 mile and a 2:30 800 by the end of that school year.
My times after that:
8th grade: 2:18 800, 5:43 mile, 20MPW
Freshman HS: 2:15 800, 5:27 mile, 30MPW
Sophmore HS: 2:11 800, 5:12 mile, 35MPW
Junior HS: 2:07 800, 4:58 mile, 45MPW
Senior HS: 2:05 800, 4:52 mile, 50MPW
Last year of college: 1:59 800, 4:07 1500, 75MPW