Hi TPIRFAN, Is the 12:20 pace based on a Magic Mile time trial? If so, it really isn't the "suggested pace" but rather your best potential pace. There is subtle but important difference there. The calculations for best potential pace assume that you already have a very solid aerobic base and that you will be doing speed work and full training. It doesn't mean that you can go out today and run for very long at that pace.
How much running experience do you have? How long is your longest distance so far? Is this your first Half Marathon? Without a good solid running base in place before you begin training for a Half, it is difficult to sustain race pace for 13 miles. Even with a solid base, it is difficult, I might add. That's why the best advice to follow if this is your first time running an endurance race is to train "to finish," which means, among other things, running it at training pace rather than race pace, or at least somewhere in between those two.
You should listen to what your body is telling you -- it isn't ready (i.e. trained) to sustain that race pace yet. Are you following a galloway training plan? What will be your longest long run? Are you doing your long runs at training pace (14:20 per mile, average pace)?
By the way, intervals should be chosen for the actual pace you are trying to run not by the pace you ran in the time trial. So for 12:20, Jeff recommends 2/1; for 14:20, he recommends :30/:30.
Edited by: LIVE2RUN4LIFE at: 6/15/2013 (19:43)
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