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So I've knocked out a 38:38 10k which apparently puts me just under the 3hrs mark for a marathon according to the calculators.
Why then can I not hold 7 m/m for more than a few miles before I'm going over 85% MHR?
I did 10 miles today at the around the above pace and was blowing out my hoop by the end of it. Am I alone or is anyone else having the same issues?