After spending too many hours reading grim news online, I got out the door for my long run, which was mostly nice though increasingly arduous towards the end.
(Note to self: when temperatures are below 50, walking 20min home from Central Park in sweaty running clothes is FREEZINGLY cold!)
About 1:33 total: ran the long way round to the park and did the entire loop. Was very good at first, went strong up hills (took 1min walking recovery after cresting anything really strenuous), but by the time I got back round to Cat's Hill I was really fading - it may have been low carbs (was shooting not to take in any during exercise), but mostly it was just that my back was really sore on anything uphill. Not sure re: cause and effect, the tendinitis-y feeling on right glute-hamstring attachment is noticeable from the beginning but doesn't really get worse or impair running, whereas the soreness in right lower back grows increasingly troublesome over time, though it's immediately relieved by walking.
Anyway slogged out the last bit with some more brief walking breaks, shut down the clock at 110th and walked 20 minutes home. Should get in shower now as fingers so cold I can hardly type!