A really lovely one, for some reason it was just excellent, only now I have idiotically but thoroughly counteracted its good effects by wrestling for half an hour with the wretched Polar Weblink--I finally got the data onto the computer, it was being particularly temperamental, but the numbers are clearly wildly implausible, I do not know what happened. A lesson to me not to depend on mechanical devices!
Anyway it was just great, not cold at all (40ish?). S. sensibly suggested five instead of six, and I suggested slow instead of fast; we sort of went at a better clip than was quite intended, but it was super-enjoyable, well worth it. HR low to mid-150s, don't really know about pace but probably sort of 8:30-9ish, phasing faster and then slower again--probably hit around 8:15-8:20 for a mile and a half or so.
I must say that really I have S. to thank for at least a minute of that 10K improvement. (May: 54:10, 8:44 pace; December: 51:33, 8:18 pace. Same [hilly] course.) There are other reasons my time dropped so much between May and now (I'd only been running a couple months again post-injury at that point, and I've certainly trained very consistently since May and with lots of sensible cross-training), but a big part of it is that running with S. keeps me honest about certain things--namely that speed matters!
I really love the mix of having long slow ones at a pace as much as a couple minutes per mile slower than the mid-week runs, but S. is significantly faster than me in a way that really makes me push myself on these Tuesday evening ones--I cannot let myself off the hook by saying "Oh, I am just good at endurance stuff, I have no turn of speed!"