Well, what do you want from this marathon? If you want a last long fast workout, you might try running the first 13-20 miles at goal 'thon pace and then drop out or very slowly walk/jog it in.
If you wish to mix in walking and running, I suggest that you take shorter walking breaks; too long of a walking break might tighten your hamstrings and lead to an injury possiblity when you resume running.
IF you have a good base, doing a 4/1 run/walk (and taking it easy on the run phase) might be a pleasant way to get in 22-23 miles of running.
It all depends on your base and what you want out of this run.
BTW, PLEASE be considerate of others who are behind you when you take your walking breaks! (I say this because you call yourself a newbie).
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