Wearing comfy shoes afterwards!
It went fine--but my feet were definitely the weak link (of course!). After only 10K or so (that's less than a quarter of the way), I felt like my shoes were wearing holes in the back of my feet (I skipped the blister stage entirely), so when Kevin stopped by at lunch time, I asked him to get some athletic tape, and stopped (wasting time! Whole seconds passing without forward progress!) in order to tape my heels. That helped for a whole, but they were painful again by the time I finished.
Also, the seat felt significantly harder (almost immediately) than it ever did before.
But I'm done! My name's on the Concept2 Marathon Challenge list, and I get a fancy downloadable certificate!
And maybe some special reward yarn/fiber on Saturday.