Ah...
That scuppers that then. I'll focus on settling into the pace early and trying to hold it.
As you say, back off if needs be
Would it be realistic to run next weekend at the same HR as whatever this week turns out to be?
I think it'd be foolish to set a target pace for Vietnam given the heat/humidity and the self professed tagline of being one of the hottest IMs in the world... People don't run fast there. Straight 10.5km out and back along the sea front.
Thinking that HR would be elevated due to the heat and would therefore bring my pace down accordingly Good plan?
-ve split is out of the equation I think