I have spent a little more time looking at the formula and in essence for me to attempt to run 02:52 marathon, it would have me run the first HM at 06:23 per mile. Then allow a progressive slow down of 3 seconds per mile. So my final mile would 07:02. About a 5 minute slow down in second HM
Having people pass in the second half would be tough, there is a "psychological" feel good factor to chase people down that are slowing down when I ran a negative split. There is also the danger that I might not slow down enough and run even faster
The 5 minute split seems a little wide and would feel happier if this was a 3 or 4 minute split. Talking to him tomorrow so will see what to decide. Happy to risk trying it though if it is to be 5 minutes.
The best book I have read recently is From Last to First by Charlie Spedding. Based on marathon running, but his big turn around in running was based within the mind. WHich is surely where are ultras are run
My first sub 3 was run of a small negative split and my second road marathon was still just a sub 3 but did not really go to plan. It became an unplanned positive split.
I am going with the suggestion to run a positive split,as my upcoming marathon is a training marathon for London, but a big part of this training schedule has been to do things that are different to improve performance. Running a planned positive split is a first for me. Anyone else back this theory or have an alternative view?