Monday was lowering-myself push-ups (so resistance on the down part, no up part), sit-ups, and Albany Hill. Did 10 push-ups, 20 sit-ups, and ran most of the way there and back (say, 40 minutes of active running or hill-climbing). I did quite well, and felt appropriately sore afterward (except for my abs -- I need to work on my sit-up form better, or something).
Wednesday--this morning--wasn't nearly as good. My legs/ankles were complaining of muscle fatigue almost from the start, so I didn't run nearly as much as I did on Monday. I ended up walking half the route home due to soreness. Had similar problems with push-ups, and I still haven't figured out what I need to do for sit-ups.
In short, my body's repair cycle seems to last longer than 48 hours. This does not bode well for doing an every-other-day schedule.
I've been told I need to have a concentrated stretching session on days off. I'll give that a try, but I was already stretching quite a bit yesterday, so I don't know.