<p>From personal experience, I like to run short the day before, with a couple of repeats at race pace, just to (1) remind myself of what it feels like, and (2) keep a little snap in my legs. By short, I mean about 1/2 the distance of my normal midweek run. If it is a goal race, or I'm aiming for a PR, I usually take a rest day two days before. So, for my half marathon on Saturday, I'll take tomorrow (Thursday) off, run 3 miles on Friday (1/2 my normal 6) with 4-5 strides at Half-marathon pace, with plenty of recovery after each. Not an anaerobic workout, just to get the legs going.</p>
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<p>Your mileage may vary, but I find the shorter run with a few pickups the day before doesn't do anything to tire me out, and helps keep a little energy in my legs. Of course, it could be all in my head ;-)</p>
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<p>Steve</p>