For the past month, apart from the odd parkrun, I have been doing all my runs ( 5 per week now) slow and easy. Last week I did 30 klms. In line with the Jack Daniels calculator for my 5K PB, I aim at running around 8 mins per Klm. However I am starting to find now when running at the effort required for this pace, I am starting to "speed up" just a little - this morning's 10K by 15 seconds per K. This is not deliberate on my part - in fact I am controlling my effort expenditure by my breathing pattern (4/4 pattern only) .
My understanding is that this is what is supposed to happen - large volume of long & slow running building a base from which cardio fitness grows and which allows faster paced training. I was finding it hard on my legs to do this slow pace -- but very easy on my lungs. Now it seems that it is becoming easier on my legs.
Who would have thought when I first graduated from C25k running for 30 minutes, that I would build it to the point where I can quite easily run for 80 minutes !! I'm still not quite sure -- WHY!! though!! Maybe just because I can????