Well, I had a pretty good run today to finish the week. An easy 11 km with company at well north of 5:20/km. Then switched to race shoes (the deadly Tarthers) and a singlet for a race pace half marathon. It was a brisk 15 degrees when we first started, but quickly warmed to a balmy 17, so the singlet was a good choice for my solo race pace run.
I went off at a strong pace and got into a rhythm that I thought was about right. The first 2km was 4:12/km, not 4:00/km. And it felt hard enough on the legs so I saw no reason to change it. The pace did pick up over the next 7 km, but only to about 4:08/k, then slipped back to 4:12/km. Heart rate was mid 140s and stayed there pretty much through 17 to 18 km after until I picked the pace up again to 4:05/km and 4:03/km for the last couple of laps (a shade under 2k per lap). Then it got up to 151.
So I did the whole thing at an average of 4:10/km. I wasn't sorry to stop, but I certainly could have kept running a while longer at that pace. The left Achilles was a bit sorer than normal, probably because of some short, sharp hill repeats I did yesterday.
The title of the post reflects the fact that I think with three or four more weeks of this kind of sharpening week, I probably could have a stab at the 4:00/km marathon. I would want a few more longish weeks but with plenty of higher intensity, like the 1600 or 2000 m repeats, a longer tempo run, and a faster long run. Hell, I will do that again this week anyway, though with an eye on tapering as regards total mileage.
Well, gotta cut it short and get some sleep. Week in summary: 107 km, including a tempo run, a 4 x 2000 m repeats, and half marathon at race pace.