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@PhilPub
^ Interesting! I've not seen a similar relationship as I've lost weight/got fitter, but then (a) I lost most of my excess weight before even starting to run competitively, and (b) I only started running regularly in the first place to "do" the marathon, so my training had an endurance bias from the outset before I discovered the joys of knowing how painful a proper 5k race should feel.
Speaking of weight, I've just had my best ever non-cheat (i.e. first thing in the morning, not after a long run when I'm dehydrated) weigh-in, 67.5kg. I think this makes me at least 1kg lighter than marathon pb weight a couple of years ago, which the calculators tell me, other things being equal (massive caveat!), is worth about 2 mins over marathon distance. We'll see...
I managed another hard tempo run last night, just squeezing in at target MP (5:43/m) for 11.5 miles, but felt very light-headed for the final mile or so. I'm hoping this is the residual effect of giving blood on Monday. Whether the road relays go ahead this weekend or not, it will be quite light on training volume, so I hope to be back to full energy by next Tuesday, which is scheduled to be my biggest MP session of the campaign. Not sure of the exact details but will be somewhere in the vicinity of 14-15 miles @ MP, so if I'm still on pace for that, game on.