Posted: Yesterday at 11:46
I'm doing a 20 miles 'race' this weekend and a HM next weekend. My plan for this weekend is something like 10 easy and 10 MP, which for me will be 10 @ 8 m/m (but probably started slower) and 10 @ 7:20 (but hopefully finishing a bit faster).
Superman - in my opinion you will leave your marathon in the 20 miler if you race it.
10 - 12 miles @ MP is enough to do in training (Freemers is an exception!) My coach tells me this is a good indicator - if you can do it then its no guarantee you will do it in the marathon but its looking very hopeful. However, if you can't manage this then you should perhaps reassess your pace for the marathon.