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You do have to remember that the projections are all just estimates. It's just a mathematical, educated guess based on a wealth of data from other runners over the years who train for and run multiple distances at consistent speeds. But it's a good way to get a ballpark on what you might be able to expect from yourself.
MY problem is, the times I've been recording for my long distance races aren't coming anywhere close to my projected times based on my 5K speed.
Here are my projections from both the McMillian and RW calculators:
McMillian
5K - 21:31
10K - 44:42
13.1M - 1:39:28
26.2M - 3:29:46
RW
5K - 21:31
10K - 44:49
13.1M - 1:38:48
26.2 - 3:25:59
And my Current PRs
5K - 21:31
10K - 47:50
13.1 - 1:45:10
26.2M - 3:59:09
See what I'm saying? Not adding up. Even if the calculators are just "ballpark" that still leaves my current marathon time over 30 minutes slower than the projections. That's huge! Shoot, that slightly optimistic projection from RW would leave me only 10 minutes shy of a Boston Qualifying time.
So, what's going wrong for me? Maybe - just maybe - my body simply isn't, what, "genetically" predisposed to running as well at the marathon distance as it does at the 5K. But I'm more apt to believe that it's my training program that is somehow lacking.
I can say, honestly, that I'm pretty good about sticking to the running program that I've used. Often, I use the free training schedules offered on the RW website. Sometimes I've set up my own schedules based on the RW system. Whichever; I get all my runs in, I hit my paces. I put in the work. Maybe I just haven't figured out the proper quantity of miles to be training on. Last year I did make an effort to up my weekly mileage, but the finish times remained roughly the same.
I guess, I also shouldn't forget that a number of the city marathons I've run have had the bad luck to be held on days when the weather was extreme and debilitating. Chicago '07 is the easiest example, but I've done 6 city-based marathons, and 3 were in unseasonably high heat.
Of course another of my marathons also came after 3 consecutive Ultras. That could be part of the problem, too: the sheer volume of ultra racing that I've done. The toll may be showing up in my marathon times. Or it could also be due to the minimal amount of hill training that I'm able to do in Chicago. I generally never get to do a weekend long run on anything other than a pancake flat course. (I'm often pinched for time during the weekend, so making long drives out of the city to look for hillier routes is tough.)
The answer for now is, I just don't know. The marathon this weekend will be a big test. I've cut out one of my variables by not running any race longer than a 5K since my 100K Ultra last December. For nearly 6 months, all I've done is build myself back up toward this one marathon. I'm also encouraged by the weather forecast for this weekend, which is still reading partly sunny with highs in the low 50s. I feel good about my chances on Saturday, but I've felt that way in the past and then turned in slow times. I remain cautious in my optimism.
If the results are different this time, though, I may have opened up a whole new territory of personal awareness about my body and my running.