Almost at the end of what felt to be a very run-of-the-mill 5 k, I looked down at my watch and realized I could hit a personal best if I sprinted like heck the last 250 meters or so. Normally I don't have much left in the tank, and I've been running mostly 3-4 k lately (finding I like short fast runs better than gentle long ones) so I'm amazed I had anything left approaching the 5 k mark. Something came over me and I ran like a crazed, possessed person until I heard my Garmin beep for the 5 k. My June pre-running self would think this was bizarre.
I was worried I was losing my endurance by loving the short runs a little too much, but the fartleks must have helped as I shaved a full minute off my best 5 k time. This bodes well for me as I have my first race in October and am having major first-race jitters.
So I will happily carry on with my lovely short fast runs, in combination with the requisite 5 k + ones. Perhaps instead of the post-graduation distance goal I originally considered I will aim for a sub 30 minute 5 k.