Luckily, I picked ther half marathon associated with the San Diego
Marathon at Carlsbad run in January and it could not have been a more
perfect race. Cool, uncrowded, great race support, gently rolling slight
hills, superb scenery, a great fair at the end of the race, and it was
over before I knew it and I did five minutes faster than my best training
run because it was so fun. Do do some overdistance beforehand -- I would
suggest at least a 15 miler -- but a 18-20 miler for optimum preparation.
I was able to run 20 seconds per mile slower than my 10K PR [7:21 per mile
for the half versus 7:01 for the 10K] and six weeks later was able to run
25 seconds per mile slower than the half marathon pace [7:46 per mile] for
the first 17 miles of my marathon. Then my legs stopped processing tyhe
lactic acid and I slogged home like a cross country skier, unable to raise
my feel from the pavement. Never hit any wall of lack of energy, just my
legs filled up with lactic acid and stopped cleaning it out.
A half is invaluable preparation for the marathon. But if you are
calculating to do your best at the marathon, plan to have more than six
weeks between the half and the full marathon. I'd suggest a combination of
longer runs peaking with the Jeff Galloway-suggested strong 1-mile repeats
up to 10 or 13 times about three weeks before the marathon -- and a 26- or
28-miler FIVE weeks before the race is ideal. I did my 23-miler two weeks
before the marathon and that was cutting it too close and I suffered for
it at mile 17. .
The key to doing well is training your legs to process and flush out the
lactic acid over such long times -- the 3 and a half to 4 and a half hours
it will take you to complete the marathon. That is, you don't need to run
long every day and run up big mileage per week. Just peak for an
every-other-week long weekend run and run to maintain fitness in between.
I predict your most fun experience will be the half and if you have done
enough work you can race the whole way. But keep in mind the perceived
energy to do a marathon is almost four times the effort required to run a
half. Remember, all you will need is some light drinking and no food
during the half -- but drinking and eating is CRUCIAL during the marathon.
Timothy Carlson