I went from 17:10 to 16:29 junior to senior year in high school. I hardly trained at all after freshman year, ran a moderate amount (35-45 miles maybe? I didn't log back then) before junior year. I was coming off a 4:38/10:10 track season, and a marathon that a friend of mine roped me into (bad idea, in retrospect, but hey, I almost broke 3 hours!). So I took it easy for a week or two after that, then probably averaged 50 or 55 miles a week for most of the summer. I went long (12mi maybe?) once a week, and my team had captain's practice with our coach once a week, so we would do some kind of workout every tuesday. It varied a lot--sometimes it was hills, sometimes it was just some moderate running and strength circuits, and sometimes it was cut-down style intervals (starting really slow, then each one getting a bit faster). I don't remember doing any other workouts on my own. I may have done hill repeats a few times at the end of the summer (can you tell I don't have my logs with me?). I did one or two road races, don't remember how I did.
With about two weeks to go before our season started, I "discovered" doubling, so I decided to give it a try. Being a reckless high schooler, I doubled 4 or 5 days a week for two week (usually only 3 or 4 miles) and went 75 miles and 85 miles the last two weeks before the season. Not sure if it helped a ton, but it sure didn't hurt, and it was a lot of fun, to be honest.
If I could go back, I'd only change a few things--I'd spread the mileage out a bit more over the summer, maybe try to average 60 or 65 miles for the last month. I'd probably go a bit further on my long run--13mi would have been a good distance. I also would have experimented with doubles a little bit more. But in all, it worked out really well. I ran 16:55 in my first race, then 16:30 on a fast course. I later ran 16:29 at the end of the season on a much, much tougher course.
I actually DID make a lot of those changes that winter--doubling more, running more mileage. I had 8 or 10 weeks in a row above 70 that winter, and I came into spring track super fit.
In closing, just make sure you're eating reasonably well and getting sleep! It makes no sense to bust out 10 runs a week if you're only averaging 7 hours of sleep every night.
Other random tips:
*run on trails more
*run with your friends (teammates) when you can--it's more fun than the "lone runner vs. the world" mentality you get into when you train alone all the time
*have fun
*try to get some carbs and protein in right after you finish your runs
*don't hammer everything (the goal is to go faster, not necessarily harder--realize the difference.)
*conversely, if you feel good, don't be afraid to "run to the barn" as malmo would say.
*run in college!
---The Collegian.