I've been looking up information about pacing, and came across this for planning what to do after you've hit the 5k target:
You put in your 5k time, and your weekly total running (minimum you can put in is 10 miles, which is more than I do, but it still gave me some very interesting ideas to think through).
For my slow (but nevertheless pretty much full-on effort-wise) 5k time of 46 min,
it suggested that most of my running should be at a pace quite a bit below that, only spending 27 minutes a week (of a 3 hr total) running at my race-pace, or faster. No wonder I've felt tired, trying to keep running at more or less my best pace for every run.
I knew this. I keep going on about slow and steady. But I still don't find it easy to actually do! As I actually only do about 1-2 hours running a week in total, 15-20 minutes a week of tempo/speed work could well be enough to still be building pace overall without getting over-tired.
I bet I'm not the only post-grad trying to run faster with every run. ???