Creating a custom workout for pacing upcoming Marathon

In a couple weeks, I'm running my 5th consecutive Boston Marathon and hope to pace a little more responsibly than I have in the past. I usually use a custom wrist pace band that is based on my marathon goal pace, adjusted for the elevation. In other words, my goal marathon pace minus or plus a few seconds for uphills and downhills. I use workouts on my F5 plus to help guide my training runs (tempos, fartleks, intervals and long runs) and am comfortable creating custom workouts. I was thinking of creating a "workout" with 27 separate steps to account for each mile in the race. I could create a pace target for each mile that corresponds with my planned split pace for that particular mile, with alerts to notify if I'm running too fast or too slow, much like my workouts now. Has anyone successfully created or implemented this in a race?

Maybe I'm just geeking out and need to set my watch to show current and last lap pace and use my good old wrist band...
  • DctrEvil had you thought of pacing based on HR rather than velocity as that should allow you to measure an even effort. I would have thought trying to estimate the correct pace to use for each mile would be quite tricky and possibly counter-productive.
  • I second this. I know what my threshold heartrate is and I use HR to meet my overall race pace. I use trainingpeaks to build a workout that has a HR range for a given distance and just adjust pace to keep within that range. I end up having to slow down to keep in that range up hills and can open up down hills. I ran a half-marathon using this method a few weeks ago that had almost 1000ft of elevation. My mile-to-mile pace would vary by 1-2 min/mile, but my overall pace ended up being within 00:05 min/mile of my goal.
  • I thought about doing something like that but for race day I decided it was a bad idea. If I don't have the perfect day that I planned and I wind up running slower for whatever reason, e.g . weather, heat, stomach, fatigue, I don't need my watch yelling and beeping at me every couple minutes that I am off pace. Stick with the wristband. Better yet just listen to your body and keep an even effort. You are an experienced, capable runner if you were able to make it to Boston. Just relax, have fun, and run smart.