Your warmup can usually be wherever you want it to be: on the course, elsewhere, wherever's available.
Whether there's a formal starting position depends on how organized the race is. Most races are self-selecting and pretty impressionistic at that. If you are planning to run a 1:40+ half you would be fine to start about 1/3 or 1/2 of the way back from the starting line. If you start farther back you can spend the race passing people, which is part of the fun of being in a large race.
You have a long time between now and Sunday and you've been training extensively. A strength workout today sounds fine to me.
My biggest nutrition issue on race day is usually blood sugar. It's an intense issue for me--I thought for a long time that I couldn't handle distance running until I realized that the issue was really that my blood sugar was dipping into dangerous territory during long runs. I rely on those Gu packets, one about 15 minutes before starting the race, one about 30 min into the race, and one about 75 min into the race. For me, advance nutrition planning wouldn't alleviate this, but YMMV.
Stay hydrated but don't overdo it.
Let yourself get into the vibe of being part of race day.
Have fun!
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