This was the case for me at the 6.5k mark of the Pioneer 8k. At least it wasn't ruining a good race. I started the race feeling a little off (I thought this might just be normal race nerves... I guess not), and still a little stiff from running earlier in the week. My first km was a little fast (3:09) and I had to bring my HR down from just over 190, but it did not come down very far. I told myself that it was just a short race and having a HR in the mid 180s was not a bad thing. Unfortunately the same thing had happened last year, and had caused me to have a second half that was more than a minute slower than my first half.
I thought that I was in better shape this year, but I blew up worse than I did last year. The time didn't show it, but I certainly felt it. And for the last 4 km I was running with people that are normally minutes behind me.
The only saving grace of this race was that out of nowhere I found enough energy to have a sprint to the line.
Time 29:44
I think the following pictures do a good job of showing how I was feeling durring the race.
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