I've been struggling with actually running, and motivation for running since ripping my calf muscle in April last year. Was just coming back from torn ligagments in my foot (thanks astroturf), and pushed too hard, felt it tighten, and then it was gone, hopped most of the way home. Took 4 months before I could even do a light jog on it. Its only this winter where I've been able to start upping the milage again. The large amounts of ice, and my heart rate and times being through the roof have really killed my motivation. I've never been so unfit, and its been getting worse. Yesterday 11 minutes miles, some thing I would consider exceptionally slow, pushed my heart rate to 184 bpm, and the average to 172bpm for a 7 mile run, and that included having to walk for half a mile in the middle just to get my heart rate back under some control.
However I just finished reading 'Born to Run' by Christopher McDougall. This is probably the only book that made me feel like running, it very entertaining, really easy to read (finished it in less than 3 days), and tells a great story, whilst at the same time covers the science of running, and why Humans are literally built to run.
Upside is this morning, I went for another run (following the god awful 7 miler with the heart rate from hell yesterday), despite a rebuke from my missus. For the first time ever, as well as my Forerunner, I had a metronome track on my ipod, just playing a 180bpm beat, so I could work on my cadence. Result was a much faster leg movement, with a really shortened stride pattern, balance was a lot better, no overstriding, foot fall pretty much under my center of gravity. Ran 3 miles, heart rate was still a little high, around 160bpm, but the graph for the run is the smoothest I've ever seen my rate, it stayed at 160 bpm for the entire run. Normally it widely weaves up and down around 20 bpm from my average.
Anyway, what I'm saying is, read the book. Its brilliant, even if it doesn't help your running, it might change why you run.