I emailed my friend MT, the voice of Dump Runners Club and one of my Green Mountain Relay teammates, to ask his opinion and analysis on my half-marathon splits. I thought I’d raced poorly since I missed a negative split, and wanted his opinion as to what I could have done differently. I’m sharing the email he sent me, because I think it’s a very helpful way to build a race strategy for a half-marathon. Also, he makes me sound like a racing genius. I pasted my splits so you can see what he’s talking about.
Okay I did some serious analysis. First of all, it was damned near perfect as far as I am concerned. (even if it it didn’t feel that way). As you may remember, I judge a half in 3 phases….the first 5 miles, the second 5 miles and the final 5k. You ran very evenly the entire race. Your first 5 miles averaged 7:53, second 5 was 7:51 and final 5k was 7:54. BTW I assumed the last 1.1 was 1.1 and not 1.25 as your watch showed. I am sure you ran more than the 13.1 distance but that is the race. This is based on Garmin.
Next, I looked at your splits and determined that you were actually going faster over your last 5k than then what the above shows. So I estimated the last 1.1 based on splits. Then I put the “extra” time evenly divided back into the previous 12 miles. Here are my alternate splits for you, First five miles avg=7:58, second 5 = 7:56 and final 3.1 was 7:40! This is more closely with what the mat times say. Which mean you have a super fast finish and were increasing your pace at every phase of the race.
I think your mat times are what happens and shows why you ran so well. Congrats.
p.s. Sorry if this is confusing