Big developments since my last post! A marathon-running buddy recommended I traing by 'heart rate interval' as opposed to 'training by pace'.
A little research (Google knows all--ALL HAIL GOOGLE!) indicates that heart rate interval training is a more effective method of preparing for a half-marathon.
Thus, I am now officially training by heart rate interval.
First, you gotta have a heart rate monitor. Luckily I had one stashed away. It came with my GPS watch. It looked uncomfortable and I figgered only elite athletes needed something like that. So I tossed it in my closet and forgot about it.
Big mistake. Have I mentioned I share a closet with a FEMALE? Finding anything in there is an epic saga in and of itself. But that's a story for another post. Bottom line is I finally found it.

Then you gotta identify your max heart rate (MHR). The easy way to do this is a simple math formula:
MHR = (208 - [0.7 x age])
Although studies show this calculation may actually be off by +- 10 beats for some people, it is by far the least painful and sweaty way to calculate your MHR (the gold standard for finding your MHR consists of doing a treadmill stress test. Since I find it stressful to get on a treadmill anyway, I chose to forego this method and instead stuck with what I know--math).
Armed with a calculated MHR of 175 bmp, I did one last little calculation to get my heart rate intervals:
Easy Run (recovery--YAY! EASY!) = 65 - 70% of MHR = 105 - 123 bpm
Training Run (aerobic training--GOOD WORKOUT!) = 75 - 80% of MHR = 131 - 149 bpm
Tempo Run (speed training--UM, OUCHIES?) = 88 - 92% of MHR = 154 - 161 bpm
Intervals (sprint training--HOLY SHIT! PAINFUL!) 95 to 100% of MHR = 166 - 175
And that's the tale of how my training for the Rock & Roll Half-Marathon got a little more complicated.
I'm running out of motivation (and coffee), so I'll end here. If you're interested in pursuing this topic further, I suggest you Google (ALL HAIL GOOGLE!) heart rate interval training. You'll get a million hits.
You can probably also find some good articles at Runners World.
I'm not tense. I'm just terribly, terribly alert.